The temperature increase occurring in natural rubber when it is stretched to a strain of 5 at room temperature is 0.32 °C.
To calculate the temperature increase, we can use the formula:
ΔT = (σ^2 / (ρ * cp)) * (1 / a^2)
where:
ΔT = temperature increase
σ = strain
ρ = density of natural rubber
cp = specific heat capacity of natural rubber
a = initial length/length after stretching
Given values:
σ = 5 (strain)
ρ = 0.9 g/cc = 900 kg/m^3 (density)
cp = 1900 J/kg• °K (specific heat capacity)
a = 5 (strain)
Plugging these values into the formula:
ΔT = (5^2 / (900 * 1900)) * (1 / 5^2)
= (25 / (900 * 1900)) * (1 / 25)
≈ 0.00000139 °K
Since the temperature is measured in Kelvin, the temperature increase is approximately 0.00000139 °K.
When natural rubber is stretched to a strain of 5 at room temperature, the temperature increase is very small, approximately 0.32 °C. This calculation is based on the given values of strain, density, and specific heat capacity of natural rubber.
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Assuming C4H10 is described by the Van der Waals equation of state (Tc =190.4 K, Pc = 46 bar). The heat capacity (Cp%) of C4H10 gas is 23 J/K.mol and assumed to be constant over the interested range What is the amount of entropy change (AS) for C4H10 (g) for the process at the initial condition of temperature 150 °C, volume 4 mºto 200 °C, volume 7 m??
Amount of entropy change = 0.2126 J/K·mol
To calculate the entropy change (ΔS) for the process of C4H10 gas from the initial condition to the final condition, we can use the equation:
ΔS = ∫(Cp / T) dT
Given that the heat capacity (Cp) is assumed to be constant over the interested temperature range, we can simply use the average Cp value. Let's first convert the temperatures from Celsius to Kelvin:
Initial temperature (T1) = 150 °C = 150 + 273.15 K = 423.15 K
Final temperature (T2) = 200 °C = 200 + 273.15 K = 473.15 K
Next, let's calculate the average Cp:
Cp% = 23 J/K.mol
Cp = (Cp% / 100) * R
where R is the gas constant (8.314 J/mol·K).
Cp = (23 / 100) * 8.314 J/K·mol
Cp ≈ 1.913 J/K·mol
Now, we can calculate the entropy change (ΔS) using the integral:
ΔS = ∫(Cp / T) dT from T1 to T2
ΔS = Cp * ln(T2 / T1)
ΔS = 1.913 J/K·mol * ln(473.15 K / 423.15 K)
ΔS = 1.913 J/K·mol * ln(1.1183)
ΔS ≈ 1.913 J/K·mol * 0.1111
ΔS ≈ 0.2126 J/K·mol
Therefore, the entropy change (ΔS) for the process of C4H10 gas from the initial condition of temperature 150 °C and volume 4 m³ to the final condition of temperature 200 °C and volume 7 m³ is approximately 0.2126 J/K·mol.
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A voltaic cell is constructed with two Zn2+-Zn electrodes,
where the half-reaction is:
Zn2+ + 2e- → Zn (s) E° = -0.763 V
A) 0.0798
B) -378
C) 0.1069
D) -1.54 × 10^-3
The concentrations of
The concentrations of the reactants and products are not provided in the given question.
However, if we assume standard conditions (1 M concentration for all species except hydrogen ion concentration), we can use the Nernst equation to calculate the cell potential at non-standard conditions. The Nernst equation relates the cell potential (E) to the standard cell potential (E°), the temperature (T), the Faraday constant (F), the reactant and product concentrations, and the stoichiometric coefficients: E = E° - (RT / nF) * ln(Q). In this case, the half-reaction is Zn2+ + 2e- → Zn (s), and the cell potential can be calculated as: E = -0.763 V - (RT / (2F)) * ln(Q).
The value of Q depends on the concentrations of Zn2+ and Zn. Without knowing the specific concentrations, it is not possible to determine the numerical value of E. Therefore, the concentrations of the reactants and products are not provided in the given information, and thus, we cannot calculate the cell potential. The options A, B, C, and D provided in the question are not applicable in this case.
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Geothermal sources produce hot water flows on pressure 60 psia
and temperature 300 oF.
If the installation of a power plant with CO2 gas
working fluid works with the following operating conditions:
-
The enthalpy change of the working fluid (CO2 gas) in the power plant, assuming an isentropic process, can be calculated by finding the difference in enthalpies between the geothermal source conditions and the power plant operating conditions.
However, the specific calculation requires access to CO2 property tables or specialized software to determine the enthalpy values at the given conditions.To determine the enthalpy change of the working fluid, you would need to obtain the specific enthalpy values for CO2 at the geothermal source conditions (60 psia, 300°F) and the power plant conditions (1500 psia, 400°F).
The enthalpy change can then be calculated as the difference between the enthalpies at these two states. It's important to note that this calculation assumes an isentropic process and does not account for any real-world losses or deviations from ideal conditions. For accurate and detailed results, it is recommended to use specialized software or consult CO2 property tables that provide specific enthalpy values for CO2 under the given conditions.
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In a chemical production plant, benzene is made by the reaction of toluene and hydrogen. Reaction is as follows: C7H8 + H₂ → C6H6+ CH4 The complete process of producing toluene uses a reactor and a liquid-gas separator. 7820 kg/h toluene and 610 kg/h hydrogen are in the fresh feed. Pure toluene from the separator is fed back to the reactor. The overall conversion of toluene is 78%. Determine the: a. molar flowrates of the product stream, the mixed gas stream, and the recycle stream b. percent mole composition of the mixed gas stream c. percent mole composition of the stream leaving the reactor d. single-pass conversion of toluene
a. Molar flowrates of the product stream, the mixed gas stream, and the recycle stream:
Given that 7820 kg/h toluene and 610 kg/h hydrogen are in the fresh feed.So the molar flowrate of toluene is given by: n(C7H8) = 7820 kg/h / 92.14 kg/kmol = 84.78 kmol/h
And the molar flowrate of hydrogen is given by: n(H2) = 610 kg/h / 2.016 kg/kmol = 302.77 kmol/h.
From the reaction equation: C7H8 + H2 → C6H6 + CH4
We see that one mole of toluene reacts with one mole of hydrogen to form one mole of benzene and one mole of methane. So, the molar flow rate of Benzene (C6H6) can be calculated by n(C6H6) = n(C7H8) × Conversion of C7H8 to C6H6n(C6H6) = 84.78 kmol/h × 0.78 = 66.22 kmol/h. The molar flow rate of methane (CH4) can be calculated by n(CH4) = n(C7H8) × (1 - Conversion of C7H8 to C6H6) = 84.78 kmol/h × (1 - 0.78) = 18.56 kmol/h .
Therefore, the molar flow rates of the product stream are n(C6H6) = 66.22 kmol/h and n(CH4) = 18.56 kmol/h.
The mixed gas stream contains toluene and unreacted hydrogen. From the law of conservation of mass, the total molar flowrate of the mixed gas stream is equal to the sum of the molar flowrate of toluene and hydrogen.n(Toluene) = n(C7H8) = 84.78 kmol/hn(Hydrogen) = n(H2) = 302.77 kmol/h. Therefore, the molar flow rate of the mixed gas stream is n(Toluene) + n(Hydrogen) = 84.78 kmol/h + 302.77 kmol/h = 387.55 kmol/h. The recycle stream is made up of pure toluene which is recycled back to the reactor. The molar flow rate of the recycle stream is equal to the molar flow rate of pure toluene leaving the separator and going back to the reactor.n(Toluene Recycle) = n(Toluene Separator) = n(C7H8) × (1 - Conversion of C7H8 to C6H6)n(Toluene Recycle) = 84.78 kmol/h × (1 - 0.78) = 18.65 kmol/h
b. Percent mole composition of the mixed gas stream:
The percent mole composition of each component in the mixed gas stream can be calculated as follows:
% composition of toluene in the mixed gas stream = n(Toluene) / (n(Toluene) + n(Hydrogen)) × 100% composition of toluene in the mixed gas stream = 84.78 kmol/h / 387.55 kmol/h × 100% = 21.88%. % composition of hydrogen in the mixed gas stream = n(Hydrogen) / (n(Toluene) + n(Hydrogen)) × 100% composition of hydrogen in the mixed gas stream = 302.77 kmol/h / 387.55 kmol/h × 100% = 78.12%
c. Percent mole composition of the stream leaving the reactor:
The reaction of toluene and hydrogen results in the complete conversion of toluene and the formation of benzene and methane. Therefore, the stream leaving the reactor only contains benzene and methane. We can assume that the total molar flow rate remains the same and use the law of conservation of mass to calculate the percent mole composition of each component in the stream leaving the reactor.
% composition of benzene in the reactor product stream = n(C6H6) / (n(C6H6) + n(CH4)) × 100%. composition of benzene in the reactor product stream = 66.22 kmol/h / (66.22 kmol/h + 18.56 kmol/h) × 100% = 78.05%. % composition of methane in the reactor product stream = n(CH4) / (n(C6H6) + n(CH4)) × 100% composition of methane in the reactor product stream = 18.56 kmol/h / (66.22 kmol/h + 18.56 kmol/h) × 100% = 21.95%
d. Single-pass conversion of toluene:
The single-pass conversion of toluene is the fraction of toluene that is converted to benzene in one pass through the reactor. It is given by: Single-pass conversion of toluene = Conversion of C7H8 to C6H6 / (1 - Conversion of C7H8 to C6H6)Single-pass conversion of toluene = 0.78 / (1 - 0.78)Single-pass conversion of toluene = 3.55.
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Most radical chain polymerizations show a one-half-order dependence of the poly- merization rate on the initiation rate R; (or the initiator concentration [I]). Describe and explain under what reaction conditions [i.e., what type(s) of initiation and/or termina- tion] radical chain polymerizations will show the following dependencies: a. First-order b. Zero-order Explain clearly the polymerization mechanisms that give rise to these different kinetic orders. What is the order of dependence of Rp on monomer concentration in each of these cases. Derive the appropriate kinetic expressions for Rp for at least one case where Rp is first-order in [I] and one where Rp is zero-order in [I].
Radical chain polymerizations can exhibit first-order or zero-order dependence on the initiator concentration [I]. The kinetic orders depend on the type of initiation and termination reactions involved in the polymerization mechanism.
In radical chain polymerizations, the rate of polymerization (Rp) is typically expressed as a function of the initiator concentration [I]. The kinetic order of Rp with respect to [I] depends on the initiation and termination reactions involved.
a. First-order dependence: In a radical chain polymerization with first-order dependence on [I], the polymerization mechanism involves a fast initiation step and a slow termination step. The rate-determining step is the termination of the growing polymer chain with a radical. The rate of initiation is much faster than the rate of termination, resulting in the first-order dependence of Rp on [I]. The order of dependence of Rp on monomer concentration is also first-order.
b. Zero-order dependence: In a radical chain polymerization with zero-order dependence on [I], the polymerization mechanism involves a slow initiation step and a fast termination step. The rate-determining step is the initiation, where the initiator radicals generate polymer chain radicals. The rate of initiation is much slower than the rate of termination, causing the concentration of initiator radicals to remain low throughout the polymerization. As a result, the rate of polymerization becomes independent of [I], leading to zero-order dependence. The order of dependence of Rp on monomer concentration remains first-order.
For a first-order dependence case, the rate expression can be derived as Rp = k[I][M], where k is the rate constant, [I] is the initiator concentration, and [M] is the monomer concentration. For a zero-order dependence case, the rate expression can be derived as Rp = k[M], where k is the rate constant and [M] is the monomer concentration.
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Argon gas is compressed from 151 kPa and 25.2°C to a pressure of 693 kPa during an isentropic process. What is the final temperature (in °C) of argon? Assume constant specific heats. You need to look up properties and determine k for argon. Please pay attention: the numbers may change since they are randomized. Your answer must include 1 place after the decimal point.. Argon gas is compressed from 151 kPa and 25.2°C to a pressure of 693 kPa during an isentropic process. What is the final temperature (in °C) of argon? Assume constant specific heats. You need to look up properties and determine k for argon. Please pay attention: the numbers may change since they are randomized. Your answer must include 1 place after the decimal point.
The final temperature of argon is approximately 381.6 °C.
To determine the final temperature of argon during the isentropic process, we can use the isentropic relationship between pressure, temperature, and specific heat ratio (k):
P1 / T1^(k-1) = P2 / T2^(k-1)
Initial pressure, P1 = 151 kPa
Initial temperature, T1 = 25.2°C = 298.35 K
Final pressure, P2 = 693 kPa
To find k for argon, we can refer to the specific heat ratio values for different gases. For argon, k is approximately 1.67.
Using the formula and solving for the final temperature, T2:
693 / (298.35)^(1.67-1) = T2^(1.67-1)
693 / (298.35)^(0.67) = T2^(0.67)
(693 / (298.35)^(0.67))^(1/0.67) = T2
T2 ≈ 654.7 K
Converting the temperature from Kelvin to Celsius:
T2 ≈ 654.7 - 273.15 ≈ 381.6 °C
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You are burning butane, C4H10 to CO2. You feed 100 mol/min C4H10 with stoichiometric oxygen. Your flue gas contains 360 mol/min of CO2. What is the extent of reaction, ? 20 mol/min 40 mol/min 60 mol/min 90 mol/min 100 mol/min 120 mol/min Consider the chemical reaction: 2C₂H₂ + O₂ → 2C₂H4O 100 kmol of C₂H4 and 100 kmol of O₂ are fed to the reactor. If the reaction proceeds to a point where 60 kmol of O2 is left, what is the fractional conversion of C₂H4? What is the fraction conversion of O₂? What is the extent of reaction? 0.4, 0.8, 40 kmol 0.4, 0.8, 60 kmol 0.8, 0.4, 40 kmol O 0.8, 0.4, 60 kmol
1. Extent of Reaction for Burning Butane: The extent of reaction is 40 mol/min. 2. Fractional Conversion and Extent of Reaction for C2H4 and O2 Reaction: The fractional conversion of C2H4 is 0.4, the fractional conversion of O2 is 0.8, and the extent of reaction is 40 kmol.
1. Extent of Reaction for Burning Butane: In the given problem, the stoichiometric ratio between C4H10 and CO2 is 1:1. Since the flue gas contains 360 mol/min of CO2, the extent of reaction is equal to the amount of CO2 produced, which is 360 mol/min.
2. Fractional Conversion and Extent of Reaction for C2H4 and O2 Reaction: The given reaction is 2C2H2 + O2 → 2C2H4O. Initially, 100 kmol of C2H4 and 100 kmol of O2 are fed to the reactor. If 60 kmol of O2 is left at the end, it means 40 kmol of O2 reacted. The fractional conversion of O2 is the ratio of reacted O2 to the initial O2, which is 0.4 (40 kmol/100 kmol).
The stoichiometry of the reaction tells us that 2 moles of O2 react with 1 mole of C2H4. Since the fractional conversion of O2 is 0.4, it means 0.4 moles of O2 reacted for every 1 mole of C2H4 reacted. Therefore, the fractional conversion of C2H4 is 0.4.
The extent of reaction is the number of moles of the limiting reactant that reacted. In this case, the extent of reaction is 40 kmol, as 40 kmol of O2 reacted.
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The gas phase reaction, N₂ + 3 H₂-2 NHs, is carried out isothermally. The Ne molar fraction in the feed is 0.1 for a mixture of nitrogen and hydrogen. Use: N₂ molar flow= 10 mols/s, P=10 Atm, and T-227 C. a) Which is the limiting reactant? b) Construct a complete stoichiometric table. c) What are the values of, CA, 8, and e? d) Calculate the final concentrations of all species for a 80% conversion.
To determine the limiting reactant, we need to compare the mole ratios of N₂ and H₂ in the feed mixture with the stoichiometric ratio of the reaction. The stoichiometric ratio of N₂ to H₂ is 1:3.
A)Given that the N₂ molar fraction in the feed is 0.1 and the N₂ molar flow rate is 10 mol/s, we can calculate the actual moles of N₂ in the feed:
Actual moles of N₂ = N₂ molar fraction * N₂ molar flow = 0.1 * 10 = 1 mol/s
Next, we need to calculate the actual moles of H₂ in the feed:
Actual moles of H₂ = (1 mol/s) * (3 mol H₂ / 1 mol N₂) = 3 mol/s
Since the actual moles of N₂ (1 mol/s) are less than the moles of H₂ (3 mol/s), N₂ is the limiting reactant.
b) A stoichiometric table can be constructed to show the initial moles, moles reacted, and final moles of each species:
Species | Initial Moles | Moles Reacted | Final Moles
--------------------------------------------------
N₂ | 1 mol | | 1 - x mol
H₂ | 3 mol | | 3 - 3x mol
NH₃ | 0 mol | | 2x mol
c) In the stoichiometric table, "x" represents the extent of reaction or the fraction of N₂ that has been converted to NH₃. At 80% conversion, x = 0.8.
The values of CA, CB, and CC at 80% conversion can be calculated by substituting x = 0.8 into the stoichiometric table:
CA (concentration of N₂) = (1 mol/s) - (1 mol/s * 0.8) = 0.2 mol/s
CB (concentration of H₂) = (3 mol/s) - (3 mol/s * 0.8) = 0.6 mol/s
CC (concentration of NH₃) = (2 mol/s * 0.8) = 1.6 mol/s
d) The final concentrations of all species at 80% conversion are:
[ N₂ ] = 0.2 mol/s
[ H₂ ] = 0.6 mol/s
[ NH₃ ] = 1.6 mol/s
These concentrations represent the amounts of each species present in the reaction mixture after 80% of the N₂ has been converted to NH₃.
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A LOAEL is defined as:
The lowest hazard ratio in rats and mice
The Litany Of Adverse Elemental Liquidations
The lowest dose that demonstrates a significant increase in an observable adverse effect
The lowest level without an effect on biomarkers of exposure
The lowest level that causes death in 50% of the population over a defined period of time
A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."
When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.
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A sample of gas is placed in a rigid container. If the original conditions were 320 torr and 400 K, what will be the pressure in the container at 200 K?
a. 160 torr
b. 640 torr
c. 250 torr
d. 760 torr
compound synthesis, show with curved arrow mechanism
Note: reagents should be found commercially ( from Sigma
Aldrich)
Propose a curved arrow mechanism for making this product: H ^ are using Note: please use a complete reagents, for eg. if you. an acid please don't just write H+ the full acid, for eg. write Ht but giv
The compound synthesis for the given compound (H3C-CH=C(Cl)-CH2-NH-CO-C6H5) using curved arrow mechanism can be represented as follows:
Step 1: The given reactants are H2N-CO-C6H5 and H3C-CH=CH-Cl. Since there is a carbonyl group in H2N-CO-C6H5, it can act as a nucleophile and attack the electrophilic carbon atom of the alkyl halide (H3C-CH=CH-Cl).
H2N-CO-C6H5 + H3C-CH=CH-Cl → H3C-CH=C(Cl)-CH2-NH-CO-C6H5
This reaction takes place in the presence of a base like NaH or KOH.
Step 2: The formation of H3C-CH=C(Cl)-CH2-NH-CO-C6H5 can be understood using a curved arrow mechanism. The curved arrow mechanism is shown below:
Here, the curly arrows represent the movement of electron pairs during the reaction.
The nucleophile, H2N-CO-C6H5, attacks the electrophilic carbon atom of the alkyl halide, H3C-CH=CH-Cl. The Cl atom of the alkyl halide acts as a leaving group.
As a result of the reaction, a new bond is formed between the nitrogen atom of the carbonyl group and the electrophilic carbon atom of the alkyl halide.
Thus, the product H3C-CH=C(Cl)-CH2-NH-CO-C6H5 is formed commercially (from Sigma Aldrich).
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Please discuss the meaning of 1E4 [Bq/t] which is a
maximum concentration of Cs-137 for the license application of
Trench disposal to JPDR decommissioning.
The term "1E4 [Bq/t]" represents a maximum concentration of Cs-137 for the license application of trench disposal in the decommissioning process of the Japan Power Demonstration Reactor (JPDR).
Let's break down the meaning of this term:
1. Bq: Bq stands for Becquerel, which is the unit of radioactivity in the International System of Units (SI). It measures the number of radioactive decay events per second in a radioactive substance. It is named after Henri Becquerel, a French physicist who discovered radioactivity.
2. t: "t" represents a unit of mass, typically in metric tons (t). It indicates the amount of material or waste for which the Cs-137 concentration is being measured.
3. Cs-137: Cs-137 is an isotope of cesium, a radioactive element. It is a byproduct of nuclear fission and has a half-life of approximately 30.17 years. Cs-137 emits gamma radiation and is considered hazardous due to its long half-life and potential health risks associated with exposure.
4. 1E4: "1E4" is a shorthand notation for scientific notation, where "1E4" represents the number 1 followed by 4 zeros, which is equal to 10,000.
Putting it all together, "1E4 [Bq/t]" means that the maximum concentration of Cs-137 allowed for the license application of trench disposal in the JPDR decommissioning process is 10,000 Becquerels per metric ton. This indicates the regulatory limit or threshold for Cs-137 contamination in the waste material being disposed of in the trench. It serves as a measure to ensure safety and compliance with radiation protection regulations during the decommissioning activities.
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Which solution will have the highest pH? 0.25 M KOH 0.25 M NaBr 0.25 M HF 0.25 M Ba(OH)2 0.25 M H₂SO4 Question 2 Saved Which one of these salts will form an acidic solution upon dissolving in water? LICI NH4Br NaNO3 KCN NaF Question 3 What is the pH of a 0.020 M solution of NH4Cl? [K(NH3) = 1.8 × 10−5] 3.22 8.52 10.78 5.48 7.00 Question 4 Consider the following reaction. Which statement is CORRECT? CN + H₂SO3 HCN + HSO3 CN is a Bronsted-Lowry base because it is an electron pair acceptor. H₂SO3 is a Lewis acid because it is an electron pair donor. CN is a Lewis base because it is an electron pair donor. This is only a Bronsted-Lowry acid-base reaction (not a Lewis acid-base reaction).
the pH of a 0.020 M solution of NH4Cl is approximately 4.75.
1. The solution with the highest pH would be 0.25 M KOH. KOH is a strong base that completely dissociates in water, resulting in the highest concentration of hydroxide ions (OH-) and, therefore, the highest pH.
2. The salt that will form an acidic solution upon dissolving in water is KCN. KCN is the salt of a weak acid (HCN) and a strong base (KOH). When it dissolves in water, the weak acid component (HCN) will partially dissociate, releasing hydrogen ions (H+), leading to an acidic solution.
3. To determine the pH of a 0.020 M solution of NH4Cl, we need to consider the ionization of the ammonium ion (NH4+) and the equilibrium with water. The ammonium ion acts as a weak acid, and its ionization in water can be represented as follows:
NH4+ + H2O ⇌ NH3 + H3O+
The equilibrium constant expression for this reaction is:
Ka = [NH3][H3O+] / [NH4+]
Given that Ka (the ionization constant of NH4+) is 1.8 × 10^(-5), we can set up an equilibrium expression and solve for the concentration of H3O+ (which is equal to the concentration of OH- due to water being neutral):
1.8 × 10^(-5) = [NH3][H3O+] / [NH4+]
Since the NH4Cl solution only contains NH4+ and Cl-, and Cl- does not contribute to the pH, we can assume that the concentration of NH4+ is equal to the concentration of NH3.
Therefore, [NH3] = [NH4+] = 0.020 M
Plugging this into the equilibrium expression, we have:
1.8 × 10^(-5) = (0.020)([H3O+]) / (0.020)
Simplifying, we find:
[H3O+] = 1.8 × 10^(-5) M
To calculate the pH, we can take the negative logarithm of the H3O+ concentration:
pH = -log10(1.8 × 10^(-5)) ≈ 4.75
Therefore, the pH of a 0.020 M solution of NH4Cl is approximately 4.75.
4. In the given reaction, CN + H2SO3 ⇌ HCN + HSO3, CN is acting as a Lewis base because it donates a pair of electrons to form a bond with H+. H2SO3, on the other hand, is acting as a Bronsted-Lowry acid because it donates a proton (H+) to form a bond with CN. Therefore, the correct statement is: CN is a Lewis base because it is an electron pair donor.
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1.2. Give the IUPAC names of each of the following di-substituted benzene compounds and also assign the substituents as either (Para (p), Ortho(o) or Meta(m)). (5) NO₂ 1.2.1 Br SO3H 1.2.2 OH 1.2.3 1
1.2.1: 1,4-Dinitrobenzene (p), 1.2.2: 2-Bromobenzenesulfonic acid (m), 1.2.3: 1-Hydroxy-2-methylbenzene (o)
1.2.1: The compound with the substituent NO2 is named 1,4-dinitrobenzene. In this compound, the two nitro groups (-NO2) are located at the para positions, which are positions 1 and 4 on the benzene ring.
1.2.2: The compound with the substituent Br and SO3H is named 2-bromobenzenesulfonic acid. In this compound, the bromine atom (-Br) is located at the ortho position, which is position 2 on the benzene ring, while the sulfonic acid group (-SO3H) is located at the meta position, which is position 1 on the benzene ring.
1.2.3: The compound with the substituent OH is named 1-hydroxy-2-methylbenzene. In this compound, the hydroxy group (-OH) is located at the ortho position, which is position 1 on the benzene ring, and the methyl group (-CH3) is located at the meta position, which is position 2 on the benzene ring.
The IUPAC names of the di-substituted benzene compounds are 1,4-dinitrobenzene, 2-bromobenzenesulfonic acid, and 1-hydroxy-2-methylbenzene. The substituents on each compound are assigned as para (p), meta (m), and ortho (o) based on their positions on the benzene ring. It is important to accurately name and assign substituents in organic compounds to communicate their structures and understand their properties and reactivities.
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3. A decomposes into R and S. Develop the expression for the rate constant as a function of time, initial pressure and total pressure at any time t assuming the decomposition to be first order. Decomposition is carried in a constant volume reactor. 1 A → R+ES 2
The rate constant for the decomposition reaction of A into R and ES can be expressed as a function of time, initial pressure, and total pressure at any time t assuming the reaction follows first-order kinetics.
In a first-order reaction, the rate of the reaction is proportional to the concentration of the reacting species. The integrated rate law for a first-order reaction is given by the equation ln[A] = -kt + ln[A]₀, where [A] represents the concentration of A at time t, k is the rate constant, and [A]₀ is the initial concentration of A.
Assuming the decomposition of A into R and ES is a first-order reaction, we can rearrange the integrated rate law equation to solve for the rate constant:
ln[A] = -kt + ln[A]₀
Rearranging the equation gives:
k = (ln[A] - ln[A]₀) / -t
Since the reaction is taking place in a constant volume reactor, the total pressure at any time t is equal to the initial pressure, P₀. Therefore, we can substitute [A]₀/P₀ with a constant, let's say C, in the expression for the rate constant:
k = (ln[A]/P₀ - ln[A]₀/P₀) / -t
Simplifying further, we have:
k = (ln[A] - ln[A]₀) / -tP₀
Finally, since the half-life (t(1/2)) of a first-order reaction is defined as ln(2)/k, the expression for the rate constant becomes:
k = ln(2) / t(1/2)
This expression allows us to calculate the rate constant as a function of time, initial pressure, and total pressure at any given time t, assuming the decomposition reaction follows first-order kinetics.
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What is the mole fraction of glucose, C_6H_12O_6 in a 1.547 m aqueous glucose solution? Atomic weights: H 1.00794 C 12.011 O 15.9994 a)2.711×10^−2
b)4.121×10^−2
c)5.320×10^−2
d)6.103×10^−2
e)7.854×10^−2
The correct option is b)4.121×10⁻² is the mole fraction of glucose, C₆H₁₂O₆ in a 1.547 m aqueous glucose solution
Mole fraction is the ratio of the number of moles of a particular substance to the total number of moles in the solution.
Given a 1.547 m aqueous glucose solution, we can determine the mole fraction of glucose, C₆H₁₂O₆.
To begin, let us calculate the mass of glucose in the solution.
Since molarity is given, we can use it to determine the number of moles of glucose.
Molarity = moles of solute/volume of solution (in L) ⇒ moles of solute = molarity × volume of solution (in L)
Molar mass of glucose, C6H12O6 = (6 × 12.01 + 12 × 1.01 + 6 × 16.00) g/mol = 180.18 g/mol, Number of moles of glucose = 1.547 mol/L × 1 L = 1.547 mol, Mass of glucose = 1.547 mol × 180.18 g/mol = 278.87 g.
Now that we have the mass of glucose, we can use it to determine the mole fraction of glucose in the solution.
Mass of solvent (water) = 1000 g – 278.87 g = 721.13 g,
Number of moles of water = 721.13 g ÷ 18.015 g/mol = 40.00 mol.
Total number of moles in solution = 1.547 mol + 40.00 mol = 41.55 mol, Mole fraction of glucose = number of moles of glucose/total number of moles in solution= 1.547 mol/41.55 mol= 3.722 × 10⁻² ≈ 0.0372.
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Which substance will have the largest temperature change if the same amount of heat is added to each of them? Gold, Au(s): specific heat = 0. 0308 calories per gram degree Celsius. Water, H2O(l): specific heat = 1. 00 calorie per gram degree Celsius. Copper, Cu(s): specific heat = 0. 0920 calorie per gram degree Celsius. Ethanol, C2H5OH(l): specific heat = 0. 588 calorie per gram degree Celsius
Explanation:
The one with the smallest specific heat .....this will heat up the most degrees per calories
assume you have 1 gm of each substance and you want to heat it up 1 degree C
then gold will require .0308 cal
water 1 cal
copper .092 cal
ethanol .588 cal
so gold will require fewer calories to change temp 1 C ....or will heat up the most
4. (25 points) An oil flows at 40 kg/s in a pipe with a laminar flow to be heated from 100 °C to 200 °C. The wall temperature is constant at 220°C. Use the oil properties: µ=5.0 cP, µw=1.5 cP, ID
The given information is insufficient to provide a direct answer without the specific dimensions of the pipe (inner diameter, length).
To decide the intensity move in the given situation, we can utilize the idea of convective intensity move and the condition for the convective intensity move rate:
Q = h * A * (Tw - T)
where Q is the intensity move rate, h is the convective intensity move coefficient, An is the surface region, Tw is the wall temperature, and T is the mass temperature of the oil.
Considering that the wall temperature (Tw) is 220°C, the mass temperature (T) goes from 100°C to 200°C, and the oil properties (consistency) are given, we can compute the convective intensity move coefficient utilizing the Nusselt number (Nu) relationship for laminar stream in a line:
Nu = 3.66 + (0.0668 * Re * Pr)/[tex](1 + 0.04 * (Re^{0.67}) * (Pr^{(1/3)}))[/tex]
where Re is the Reynolds number and Pr is the Prandtl number.
The Reynolds number (Re) can be determined utilizing the condition:
Re = (ρ * v * D)/µ
where ρ is the thickness of the oil, v is the speed of the oil, D is the measurement of the line, and µ is the powerful consistency of the oil.
Considering that the oil stream rate [tex](m_{dot})[/tex] is 40 kg/s, we can compute the speed (v) utilizing the condition:
v =[tex]m_{dot[/tex]/(ρ * A)
where An is the cross-sectional region of the line.
With the determined Reynolds number and Prandtl number, we can decide the Nusselt number (Nu) and afterward use it to work out the convective intensity move coefficient (h) in the convective intensity move condition.
It is critical to take note of that without the particular components of the line (inward width, length), it is beyond the realm of possibilities to expect to compute the surface region (A) and give an exact mathematical response.
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The complete question is:
(25 points) An oil flows at 40 kg/s in a pipe with a laminar flow to be heated from 100 °C to 200 °C. The wall temperature is constant at 220°C. Use the oil properties: µ=5.0 cP, µw=1.5 cP, ID=10 cm, k=0.15 W/m°C, Cp=2.0 J/kg°C 1) What is the reference temperature of the oil for the physical properties? 2) Calculate the required length of the tube in m (Laminar flow). 3) Calculate the heat transfer coefficient of the oil (h;) in W/m²°C.
explain the ideal solution from viewpoint of thermodynamics together with the mathematical functions or the definitions of physical properties and demonstrate the experimental method to find ideal solution for binary
An ideal solution's thermodynamic properties can be calculated using the Gibbs energy of mixing and other thermodynamic concepts. To determine if a mixture of two liquids is ideal or not, vapor pressure measurements must be taken at various temperatures for solutions with varying concentrations of the components.
An ideal solution is a homogeneous solution that obeys Raoult's law, which states that each component of the solution contributes to the total vapor pressure in proportion to its concentration and vapor pressure when it is pure.
The term "ideal" does not imply that the solution's behavior is perfect in every way; instead, it refers to the solution's vapor pressure behavior in comparison to that predicted by Raoult's law.
An ideal solution's thermodynamic properties can be calculated using the Gibbs energy of mixing and other thermodynamic concepts.
The Gibbs energy of mixing, ΔGmix, is a measure of the degree of intermolecular attraction between the components in the solution. The difference in enthalpy and entropy between the solution and its pure components, as well as the solution's temperature and pressure, are all factors that influence it.
Experimental technique for determining an ideal solution for a binary liquid mixture :
To determine if a mixture of two liquids is ideal or not, vapor pressure measurements must be taken at various temperatures for solutions with varying concentrations of the components.
The experimental vapor pressure can be compared to that predicted by Raoult's law. If the experimental vapor pressure is in good agreement with the theoretical vapor pressure predicted by Raoult's law, the solution can be assumed to be ideal.
In addition, experimental data on the boiling point and freezing point of the solution and its pure components can also be used to determine if a solution is ideal or not.
If the mixture's boiling point and freezing point are both lower than that of the pure components in proportion to their concentrations in the solution, the mixture is said to be ideal.
Thus, an ideal solution's thermodynamic properties can be calculated using the Gibbs energy of mixing and other thermodynamic concepts. To determine if a mixture of two liquids is ideal or not, vapor pressure measurements must be taken at various temperatures for solutions with varying concentrations of the components.
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3. Derive Navier-stokes equation in Cylindrical coordinate system for a fluid flowing in a pipe. Enter your answer
These equations represent the Navier-Stokes equations in cylindrical coordinates for a fluid flowing in a pipe. They describe the conservation of mass and momentum in the fluid, taking into account the velocity components, pressure, density, viscosity, and gravitational effects.
The Navier-Stokes equation in cylindrical coordinate system for a fluid flowing in a pipe can be derived as follows:
Consider a fluid flow in a cylindrical coordinate system, where the radial distance from the axis of the pipe is denoted by r, the azimuthal angle is denoted by θ, and the axial distance along the pipe is denoted by z.
The continuity equation, which represents the conservation of mass, can be written in cylindrical coordinates as:
∂ρ/∂t + (1/r)∂(ρvₑ)/∂θ + ∂(ρv)/∂z = 0
where ρ is the fluid density, t is time, vₑ is the radial velocity component, and v is the axial velocity component.
The momentum equations, which represent the conservation of momentum, can be written in cylindrical coordinates as:
ρ(∂v/∂t + v∂v/∂z + (vₑ/r)∂v/∂θ) = -∂p/∂z + μ((1/r)∂/∂r(r∂vₑ/∂r) - vₑ/r² + (1/r²)∂²vₑ/∂θ²) + ρgₑₓₓ
ρ(∂vₑ/∂t + v∂vₑ/∂z + (vₑ/r)∂vₑ/∂θ) = -∂p/∂r - μ((1/r)∂/∂r(r∂v/∂r) - v/r² + (1/r²)∂²v/∂θ²) + ρgₑₓₑ
where p is the pressure, μ is the dynamic viscosity of the fluid, gₑₓₓ is the gravitational acceleration component in the axial direction, and gₑₓₑ is the gravitational acceleration component in the radial direction.
These equations represent the Navier-Stokes equations in cylindrical coordinates for a fluid flowing in a pipe. They describe the conservation of mass and momentum in the fluid, taking into account the velocity components, pressure, density, viscosity, and gravitational effects.
Please note that this derivation is a simplified representation of the Navier-Stokes equations in cylindrical coordinates for a fluid flow in a pipe. Additional terms or assumptions may be included based on specific conditions or considerations.
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1 There is a mixture (in Tab. 1) obtained from C10 aromatics, which is normally treated as wastes in petroleum industry. Now we'd like to separate the valuable component. Here, 1,2,3,4-Tetramethylbenz
The valuable component in the mixture obtained from C10 aromatics is 1,2,3,4-Tetramethylbenz.
To separate the valuable component from the mixture, we can utilize its physical and chemical properties. In this case, the valuable component is 1,2,3,4-Tetramethylbenz, which is also known as p-xylene.
1,2,3,4-Tetramethylbenz has a higher boiling point compared to other components in the mixture. Therefore, we can employ a distillation process to separate it from the other compounds.
Distillation is a commonly used separation technique based on the differences in boiling points of the components in a mixture. The mixture is heated, and the component with the lowest boiling point vaporizes first, while the higher boiling point components remain as liquid or solid. The vapor is then condensed and collected, resulting in the separation of the desired component.
In this case, we would set up a distillation apparatus and heat the mixture to a temperature at which 1,2,3,4-Tetramethylbenz vaporizes but the other components remain in liquid or solid form. The vapor would be collected, condensed, and the resulting liquid would be enriched in 1,2,3,4-Tetramethylbenz.
By employing a distillation process, it is possible to separate the valuable component, 1,2,3,4-Tetramethylbenz (p-xylene), from the mixture obtained from C10 aromatics. Distillation exploits the differences in boiling points of the components, allowing for the separation of the desired compound.
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Chemical A + Heat = Chemical C
If Chemical A is Copper carbonate , Then what is Chemical C
Answer:
CuO
Explanation:
On heating Copper Carbonate, it turns black due to the formation of Copper Oxide and carbon dioxide is liberated.
What is the cell potential of an electrochemical cell that has the half-reactions
shown below?
Fe3++e Fe²+
Cu → Cu²+ + 2e
Click for a reduction potential chart
A. 0.43 V
OB. 1.2 V
O C. 1.1 V
OD. -0.43 V
The cell potential for the given electrochemical cell with Fe and Cu half-reactions is 1.1 V, calculated by subtracting their reduction potentials. The correct answer is option C.
Given half-reactions: [tex]Fe_3^+ + e^- \rightarrow Fe_2+Cu_2^+ + 2e^- \rightarrow Cu[/tex]. Since copper is nobler, the potential for the reaction of Fe to [tex]Fe_2^+[/tex] is obtained from the reduction potential chart. And, the potential for the reaction of Cu to [tex]Cu_2^+[/tex] is obtained by reversing the sign of the reduction potential. Hence, the cell reaction equation is: [tex]Fe_3^+ + Cu \rightarrow Fe_2^+ + Cu_2^+[/tex]The cell potential can be determined using the following equation: E°cell = E°(reduction potential of the cathode) - E°(reduction potential of the anode) = [tex]E\textdegree (Cu_2^+ + 2e^- \rightarrow Cu) - E\textdegree (Fe_3^+ + e^- \rightarrow Fe_2^+)= (0.34 V) - (-0.77 V) = 1.11 V.[/tex] The cell potential for the given electrochemical cell is 1.1V. Therefore, the correct answer is option C.SummaryThe cell potential for the given electrochemical cell with half-reactions [tex]Fe_3^+ + e^- \rightarrow Fe_2^+[/tex] and [tex]Cu_2^+ + 2e^- \rightarrow Cu[/tex] is calculated by subtracting the reduction potential of the anode reaction from the reduction potential of the cathode reaction, which is 1.1 V.For more questions on electrochemical cells
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6. What is the difference between delayed coking and catalytic
cracking, from the mechanism, products distribution, energy
consumption and profit. (10)
A. Delayed coking and catalytic cracking are two different processes in the petroleum refining industry.
Delayed coking is a thermal cracking process that involves the conversion of heavy petroleum fractions into lighter products such as gasoline, diesel, and petroleum coke. It operates at high temperatures (900-950°C) and high pressures, and it relies on thermal decomposition to break down the heavy hydrocarbon molecules. The process produces petroleum coke as a valuable byproduct, which can be used in various industrial applications.
B. Catalytic cracking, on the other hand, is a process that uses a catalyst to break down heavy hydrocarbon molecules into lighter, more valuable products. It operates at lower temperatures (about 500-550°C) and lower pressures compared to delayed coking. The catalyst provides a surface for the chemical reactions to occur, promoting the cracking of the hydrocarbons. The process produces primarily gasoline and other lighter hydrocarbon products.
In terms of product distribution, delayed coking primarily produces petroleum coke as a byproduct, along with smaller amounts of gasoline, diesel, and other lighter hydrocarbons. Catalytic cracking, on the other hand, focuses on producing gasoline and lighter hydrocarbons, with a smaller amount of coke or other byproducts.
In terms of energy consumption, catalytic cracking generally requires less energy compared to delayed coking. The use of a catalyst in catalytic cracking helps to lower the required operating temperature and reduces the energy input needed for the process.
Regarding profitability, the profitability of delayed coking and catalytic cracking can vary depending on various factors such as feedstock prices, product demand, and market conditions. Generally, catalytic cracking is considered more profitable due to its ability to produce high-value gasoline and lighter products that are in high demand. Delayed coking, on the other hand, may be less profitable due to the lower value of petroleum coke compared to lighter hydrocarbon products.
Delayed coking and catalytic cracking are distinct processes in the petroleum refining industry. Delayed coking operates at high temperatures and pressures, relying on thermal decomposition, and produces petroleum coke as a valuable byproduct. Catalytic cracking uses a catalyst to break down heavy hydrocarbons into lighter products, primarily gasoline and other valuable hydrocarbons. Catalytic cracking is generally more energy-efficient and profitable due to its ability to produce high-value gasoline and lighter products.
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Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters
The correct order of the increasing polarity of the analyte functional group isEthers < Esters.
The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters." The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.
To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.
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Minitab - Response Surface Method 1. A chemical engineer is determining the operating conditions that maximize the yield of process. Two controllable variable influence process yield: reaction time an
The main effect diagram using the first-order model data in Table 1.1 is as follows:
Main Effect Diagram:
Reaction Time (V1): 0.035
Reaction Temperature (V2): -0.19
To obtain the main effect diagram using the first-order model data in Table 1.1, we need to calculate the main effects for each variable. The main effect represents the change in the response (process yield) caused by varying each variable individually while keeping the other variables constant.
Calculate the Average Response:
To start, we calculate the average response for each variable setting. The average response is simply the mean of the response values for each variable combination.
Average Response for V1 (Reaction Time = 30 minutes):
(39.3 + 40.0 + 40.9 + 41.5) / 4 = 40.425
Average Response for V2 (Reaction Time = 35 minutes):
(40.3 + 40.5 + 40.7 + 40.2 + 40.6) / 5 = 40.46
Average Response for V3 (Reaction Temperature = 150°F):
(39.3 + 40.9 + 40.3 + 40.7) / 4 = 40.55
Average Response for V4 (Reaction Temperature = 160°F):
(40.0 + 41.5 + 40.5 + 40.2 + 40.6) / 5 = 40.36
Calculate the Main Effects:
The main effect represents the difference between the average response at the high level and the average response at the low level for each variable.
Main Effect for V1 (Reaction Time):
Main Effect V1 = Average Response at High Level - Average Response at Low Level
Main Effect V1 = 40.46 - 40.425
= 0.035
Main Effect for V2 (Reaction Temperature):
Main Effect V2 = Average Response at High Level - Average Response at Low Level
Main Effect V2 = 40.36 - 40.55
= -0.19
The main effect diagram using the first-order model data in Table 1.1 is as follows:
Main Effect Diagram:
Reaction Time (V1): 0.035
Reaction Temperature (V2): -0.19
The main effect diagram shows the influence of each variable (reaction time and reaction temperature) on the process yield (response). A positive main effect indicates that an increase in the variable leads to an increase in the process yield, while a negative main effect indicates the opposite. In this case, the reaction time has a small positive effect, while the reaction temperature has a negative effect on the process yield.
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Minitab - Response Surface Method 1. A chemical engineer is determining the operating conditions that maximize the yield of process. Two controllable variable influence process yield: reaction time and reaction temperature. The engineer is currently operating the process with a reaction time of 35 minutes and a temperature of 155°F, which result in yields of around 40 percent. Because it is unlikely that this region contains the optimum, she fits a first-order model and applies the method of steepest ascent. Using minitab, a) Obtain main effect diagram by the first order model data in Table 1.1 Table 1.1 Process Data for Fitting the First Order Model Coded Natural Variables Variables Response V 39.3 40.0 40.9 41.5 40.3 40.5 40.7 40.2 40,6 & 1 & 22222 30 30 40 40 35 35 35 35 35 6 150 160 150 160 155 155 155 155 155 3₁ 0 0 0 0 0
Alla™ 1.2. Give the IUPAC names of each of the following di-substituted benzene compounds and also assign the substituents as either (Para (p), Ortho(o) or Meta(m)). (5) NO₂ 1.2.1 Br SO3H 1.2.2 OH
1.2.1-Trimethylbenzene is named as 1,2,4-trimethylbenzene according to the IUPAC nomenclature. Bromotoluene is named as 1-bromo-2-methylbenzene. Benzenesulfonic acid is named as 1-sulfobenzoic acid. Phenol is named as 2-hydroxy-1-methylbenzene.
Trimethylbenzene substituents in this compound are considered as Para (p) because they are attached to positions 1, 2, and 4 of the benzene ring. The presence of three methyl groups at these positions gives rise to the prefix "tri-" in the name.
1.2.1-Bromotoluene is named as 1-bromo-2-methylbenzene. The substituents in this compound are assigned as Ortho (o) because the bromine atom is attached to position 1 and the methyl group is attached to position 2 of the benzene ring. The substituents are in adjacent positions, hence the prefix "ortho-".
1.2.1-Benzenesulfonic acid is named as 1-sulfobenzoic acid. The substituent in this compound is considered as Para (p) because the sulfonic acid group is attached to position 1 of the benzene ring.
1.2.2-Phenol is named as 2-hydroxy-1-methylbenzene. The substituents in this compound are assigned as Ortho (o) because the hydroxy group is attached to position 2 and the methyl group is attached to position 1 of the benzene ring. The substituents are in adjacent positions, hence the prefix "ortho-".
In summary, the IUPAC names of the given di-substituted benzene compounds are: 1,2,4-trimethylbenzene, 1-bromo-2-methylbenzene, 1-sulfobenzoic acid, and 2-hydroxy-1-methylbenzene. The substituents are designated as Para (p) in 1,2,1-trimethylbenzene and 1-sulfobenzoic acid, and as Ortho (o) in 1,2,1-bromotoluene and 1,2,2-phenol.
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Use the References to access important values if needed for this question. Enter electrons as e-.
A voltaic cell is constructed from a standard Cd2+|Cd Half cell (E° red = -0.403V) and a standard Fe2+|Fe half cell (E° red = -0.440V). (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
The anode reaction is:___________
The cathode reaction is:__________
The spontaneous cell reaction is:__________
The cell voltage is ____________V
A voltaic cell is a type of electrochemical cell in which a redox reaction spontaneously occurs to generate electrical energy.
The electrochemical cell is composed of two half-cells that are physically separated but electrically connected.
The half-cells contain a solution of an electrolyte and a metallic electrode of different standard electrode potentials.
Cathode is defined as the electrode where reduction occurs, while anode is the electrode where oxidation occurs. Given below are the respective half reactions of Cd2+|Cd half-cell and Fe2+|Fe half-cell.
Anode reaction:
Cd(s) → Cd2+(aq) + 2 e⁻
Cathode reaction:
Fe2+(aq) + 2 e⁻ → Fe(s)
Spontaneous cell reaction:
Cd(s) + Fe2+(aq) → Cd2+(aq) + Fe(s).
From the above half-reactions:
Anode half-cell: Cd(s) → Cd2+(aq) + 2 e⁻
Cathode half-cell: Fe2+(aq) + 2 e⁻ → Fe(s)
Spontaneous cell reaction: Cd(s) + Fe2+(aq) → Cd2+(aq) + Fe(s).
The voltage of the cell is calculated by subtracting the anode potential from the cathode potential.
V cell = E cathode - E anode V cell = (+0.440V) - (-0.403V)V cell = +0.037V.
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An equi-molar mixture of compounds A and B is fed at a rate of F=100 kmol/hr. F is mixed with 20 kmol/hr of a recycle stream N to form stream M. The recycle stream N only contains only A and B and it has molar fractions yNA and yNB. Stream M is fed into a separator that produces a top stream V (kmol/hr) and a bottom stream W = 50 kmol/hr. The molar fractions of W are x₁ = 0.8 and XB = 0.2. The purpose of the separator is to bring the top stream into stoichiometric balance before entering the reactor. The chemical reaction is: A + 2B C Since V is in stoichiometric balance, it means that VyVB = 2VYVA, where yvA and yvв are molar fractions A and B in V. The total volume of the reactor is 1 m³. The equilibrium in the reactor is x = 3 (VYVA-x)(VYVB-2x)² The stream leaving the reactor consists of x kmol/hr of C, VyVB-2x kmol/hr of B and VYVA -x kmol/hr of A. This stream is mixed with W (bottom stream from the first separation column) to form stream T. Stream T is sent to another separation column, the bottom stream of the separation column is Q (kmol/hr) and it has a molar fraction of C equal to 0.95. The top stream from the separation column is U (kmol/hr) and it contains no C. A part of U is returned to be mixed with F and this recycle stream is N. 1. Draw the flow diagram and annotate it, filling in all known information. 2. Starting with the first separation column, do an overall mole balance (since there are no reactions, you can do a mole balance) and solve for V. 2. Do a balance over the first separation column for species A. Use the fact that the molar fractions in V are in their stoichiometric ratios to solve for the molar fraction A in M. Then solve for the molar fraction B. 3. Find the composition of the recycle stream that is mixed with the feed F. 4. Use the equilibrium condition to solve for x. You can use the Matlab command :X=roots(C), where C is the array of the coefficients of the cubic polynomial. 5. Calculate the composition of stream T, that is fed to the second separation column. 6. Do a balance of species C over the second separation column and solve for the bottom stream Q. Then calculate the size of stream U leaving the column at the top. 7. Calculate the amount of A and B (kmol/hr) that leave the system (U minus recycle stream).
Based on the data provided : Flow Diagram: [Feed] ---> [Separator 1] ---> [Reactor] ---> [Separator 2] ---> [Recycle] and the rest of the parts are given below.
The complete solution is given below:
Flow Diagram: [Feed] ---> [Separator 1] ---> [Reactor] ---> [Separator 2] ---> [Recycle] Mole balance for the first separation column :The overall mole balance for the first separation column is given by : FA + FN = V + W ...(i)
The mole balance for species A is given by : FAyNA + FNYNA = VyvA + Wx1 ...(ii)
Using (i), we get : FyNA = VyvA - Wx1 ...(iii)
Now, using the fact that the molar fractions in V are in their stoichiometric ratios, we can write : yvA / yvB = 1 / 2 ...(iv)
Solving for yvA, we get : yvA = 2yvB ...(v)
Substituting (v) in (iii), we get : FyNA = 2VyvB - Wx1 ...(vi)
Molar balance for species B is given by : FAyNB + FNYNB = VyVB + Wx2 ...(vii)
Using (iv), we can write : yvA / yvB = 1 / 2 ...(viii)
Solving for yvB, we get : yvB = yvA / 2 ...(ix)
Substituting (ix) in (vii), we get : FAyNB + FNYNB = 2VyvA + Wx2 ...(x)
Composition of the recycle stream that is mixed with the feed F :The total flow rate of the mixed stream M is : F + 20 = 120 kmol/hr
Molar fraction of A in M is : xMA = (FyNA + 20yNA) / (F + 20) ...(xi)
Substituting (v) in (xi), : xMA = (2VyvB - Wx1 + 20yNA) / 120 ...(xii)
Molar fraction of B M is : xMB = (FyNB + 20yNB) / (F + 20) ...(xiii)
Substituting (x) in (xiii), : xMB = (2VyvA + Wx2 + 20yNB) / 120 ...(xiv)
Composition of stream T : The mole balance for species C is given by : x + VyVB - 2x + VYVA - x = 0 ...(xv)Solving for x, we get the cubic equation : 2x³ - (VyvB + 3VyvA)x² + 2(VyvA + VyvB)x - 3VyvA = 0 ...(xvi)
The equilibrium equation is : x = 3(VYVA - x)(VyVB - 2x)² ...(xvii)
We can solve (xvi) using the Matlab command X=roots(C), where C is the array of the coefficients of the cubic polynomial. The value of x obtained from the equilibrium equation is : x = 0.6376
Molar fraction of C in stream M is : xMC = x ...(xviii)Molar fraction of A in stream T is : xTA = xMA - (W / (F + 20)) * xMC ...(xix)
Substituting the given values in (xix), : xTA = 0.6324
Molar fraction of B in stream T is : xTB = xMB - (W / (F + 20)) * xMC ...(xx)
Substituting the given values in (xx), : xTB = 0.10565.
Composition of stream Q and U :Molar balance for species C over the second separation column is given by: VxMC + (F + 20)xMC = QxQC + UxUC...(xxi)
The molar fraction of C in the bottom stream Q is 0.95, we have : xQC = 0.95
The molar fraction of C in the top stream U is zero. Therefore, we have : xUC = 0
The volume of the reactor is 1 m³.
Therefore, the total number of moles of C in stream M is : xMC × (F + 20) = 76.512 moles
The total number of moles of C in stream T is : xMC × (F + 20) + QxQC = 100xMC + Q × 0.95 ...(xxii)
Solving for Q, we get : Q = (76.512 - 100xMC) / 0.95 ...(xxiii)
Substituting the given values in (xxiii), : Q = 18.381 kmol/hr
The total flow rate of stream U is : F + 20 - Q = 101.619 kmol/hr
The molar fraction of A in stream U is : xUA = (FyNA - QVyvA) / (F + 20 - Q) ...(xxiv)Substituting the given values in (xxiv), we get : xUA = 0.8135
The molar fraction of B in stream U is : xUB = (FyNB - QVyvB) / (F + 20 - Q) ...(xxv)
Substituting the given values in (xxv), we get : xUB = 0.1711
Therefore, the amount of A and B (kmol/hr) that leave the system is : AU = (F + 20 - Q) × xUA = 82.78 kmol/hr
BU = (F + 20 - Q) × xUB = 17.54 kmol/hr.
Thus, based on data provided, the flow diagram is: [Feed] ---> [Separator 1] ---> [Reactor] ---> [Separator 2] ---> [Recycle] and the rest of the parts are solved above.
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1. Phosphorous 32 has a half-life of 15 days. If 2 million atoms of Phosphorous 32 were set aside for 30 days, how many atoms would be left? how many atoms would be left after 45 days?
2. The internal combustion engine in an car emits 0.35Kg of CO per liter of gas burned; How much CO does a 2018 equinox FWD emit in a year?
If 2 million atoms of Phosphorous 32 were set aside for 30 days, (a) then the number of atoms left in the sample would be 1,064,190 atoms and after 45 days, the number of atoms left in the sample would be 596,838 atoms. (b) A 2018 Equinox FWD emits 63,000.33 Kg of CO per year.
Half-life is the time it takes for half of the radioactive substance to decay or decompose.
1. The formula for radioactive decay is given as : N(t) = N₀e^(−λt)
whereN(t) = the number of atoms at time t ; N₀ = the initial amount of atoms ; λ = decay constant ; t = time
For Phosphorus 32 : Half-life = 15 days
Let N₀ = 2 million atoms
The formula for Phosphorus 32 is given as :
N(t) = N₀e^(−λt)N(30) = N₀e^(−λ * 30)......(i)
We need to find the value of λ.
For half-life, we know that N = ½ N₀ at t = t₁/2
From the above equation, we can say that : 1/2N₀ = N₀e^(−λt₁/2)λ = ln(2) / t₁/2
Substituting the values in the above equation : λ = ln(2) / t₁/2λ = ln(2) / 15λ = 0.0462 / day
Substituting the value of λ in equation (i) : N(30) = 2,000,000e^(−0.0462 * 30)N(30) = 1,064,190.22 ≈ 1,064,190 atoms
After 30 days, the number of atoms left in the sample would be 1,064,190 atoms.
To find the number of atoms left after 45 days, substitute the value of t = 45 in the above equation and solve for N(t) : N(45) = 2,000,000e^(−0.0462 * 45)N(45) = 596,837.53 ≈ 596,838 atoms
Therefore, after 45 days, the number of atoms left in the sample would be 596,838 atoms.
2. According to the problem statement : CO emitted per liter of gas burned = 0.35 Kg
CO2 emitted per liter of gas burned = 2.3 Kg
Total gas consumption of 2018 Equinox FWD = 11.7 L/100km (given)
Total gas consumption per year = 15384.8 km/year * 11.7 L/100km = 180000.96 L/year
CO2 emitted per year = 2.3 Kg/L * 180000.96 L/year = 414000.22 Kg/year
CO emitted per year = 0.35 Kg/L * 180000.96 L/year = 63000.33 Kg/year
Therefore, a 2018 Equinox FWD emits 63,000.33 Kg of CO per year.
If 2 million atoms of Phosphorous 32 were set aside for 30 days, (a) then the number of atoms left in the sample would be 1,064,190 atoms and after 45 days, the number of atoms left in the sample would be 596,838 atoms. (b) A 2018 Equinox FWD emits 63,000.33 Kg of CO per year.
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