A 2.550×10−2 M glycerol solution (C3H8O3) in water is at 20.0 ∘C . The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 998.9 mL. The density of water at 20.0 ∘C is 0.9982 g/mL
a.) Calculate the molality of the glycerol solution
b.) Calculate the mole fraction of glycerol in this solution
c.) Calculate the concentration of the glycerol solution in percent by mass
d.) Calculate the concentration of the glycerol solution in parts per million by mass

Answers

Answer 1

The molality of the solution is 0.0256 m.

The mole fraction of glycerol is  0.00046

The percent by mass concentration of glycerol is 0.23%

The ppm concentration is 2300 ppm

What is the molality?

Molality is a measure of the concentration of a solute in a solution. It is defined as the number of moles of solute per kilogram of solvent.

The formula for molality is:

molality = moles of solute / mass of solvent in kilograms

1) Density of water = mass/volume

Mass of water = Density * volume of water

Mass =[tex]0.9982 g/mL * 998.9 mL[/tex]

Mass =0.997 Kg of water

Number of moles of the glycerol =  [tex]2.550* 10^-2 M * 1 L[/tex]

= [tex]2.550*10^-2[/tex] moles

Molality of the solution = [tex]2.550*10^-2[/tex]  moles/0.997 Kg

= 0.0256 m

Number of moles of water = 998.9/18 g/mol

= 55.5 mole

Mole fraction of glycerol = [tex]2.550*10^-2[/tex] /[tex]2.550*10^-2[/tex]  + 55.5

= 0.00046

By percent by mass;

2.3/1001.2 * 100/1

= 0.23%

Mass of glycerol = 2.3 g

Volume of solution = 1 L

Thus we have concentration in ppm as;

[tex]2.3 * 10^3[/tex] mg/ 1 L =2300 ppm

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Related Questions

5 moles of a monoatomic ideal gas is compressed reversibly and adiabatically. The initial volume is 6 dm3 and the final volume is 2 dm3. The initial temperature is 27°C.

(i) What would be the final temperature in this process?

(ii) Calculate w, q and ΔE for the process. Given Cv = 20.91 J K−1 mol−1, γ = 1.4

Answers

Final temperature: 677.4K. Work done: -7026J.

Heat exchanged: 0J. Change in internal energy: -7026J.

How to solve

(i) For an adiabatic process, T1(V1)^γ-1 = T2(V2)^γ-1.

When we substitute the values (γ=1.4, T1=300K, V1=6dm³, V2=2dm³), we get T2 = 677.4K.

(ii) w = -(P1V1 - P2V2)/(γ-1) = -(nRT1 - nRT2)/(γ-1) = -5 * 8.314 * (677.4 - 300) / 0.4 = -7026J.

For adiabatic, q = 0. ΔE = q + w = -7026J (since q=0).

Final temperature: 677.4K. Work done: -7026J.

Heat exchanged: 0J. Change in internal energy: -7026J.

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Chemistry balance equation
At equilibrium, the value of K = 0.00659 for the reaction: N₂ (g) + 3 H₂ (g) ← → 2 NH₃ (g). Calculate [N₂] when [NH₃] = 0.000123 M and [H₂] = 0.0275 M

Answers

The concentration of the ammonia from the calculation is  [tex]1.1 * 10^-15[/tex]M.

What is the equilibrium constant?

The ratio of the concentrations of products to reactants in chemical equilibrium, for a given chemical reaction at a given temperature, is described by the equilibrium constant, abbreviated as Kc or Keq.

We can see that;

[tex]Keq = [NH_{3} ]^2/[N_{2} ] [ H_{2}]^3\\Keq[N_{2} ] [ H_{2}]^3 = [NH_{3}]^2\\\\N_{2} ] = [NH_{3}]^2/Keq[ H_{2}]^3[/tex]

=[tex](0.000123 )^2/ 0.00659 * (0.0275)^3= 1.1 * 10^-15 M[/tex]

Thus we would have the nitrogen concentration as [tex]1.1 * 10^-15[/tex] M

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Nitrogen dioxide gas and liquid water react to form aqueous nitric acid and nitrogen monoxide gas. Suppose you have 5.0 mol of NO2 and 11.0 mol of H2O in a reactor.

Calculate the largest amount of HNO3 that could be produced. Round your answer to the nearest 0.1 mol

Answers

First, we need to write the balanced chemical equation for the reaction:

2 NO2(g) + H2O(l) → HNO3(aq) + NO(g)

From the equation, we can see that 2 moles of NO2 react with 1 mole of H2O to produce 1 mole of HNO3 and 1 mole of NO. Therefore, we need to determine which reactant is limiting and calculate the amount of HNO3 that can be produced based on that.

To do this, we can use the mole ratio of NO2 to H2O:

5.0 mol NO2 × (1 mol H2O / 2 mol NO2) = 2.5 mol H2O

Since we have 11.0 mol of H2O, it is not limiting and we will use up all of the NO2.

Therefore, we can calculate the amount of HNO3 that can be produced from 5.0 mol of NO2:

5.0 mol NO2 × (1 mol HNO3 / 2 mol NO2) = 2.5 mol HNO3

Therefore, the largest amount of HNO3 that could be produced is 2.5 mol, rounded to the nearest 0.1 mol.

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Н
HOH
14
Н-С-С-С-Н
I
ННН
List the number of each atom in the formulas above:
H
НН Н
Н-С-С-С-О-Н
LI
НН Н
DONE
Н Н
H
Н-С-С-О-С-Н
II
Н Н
H

Answers

Answer:

Explanation:

It seems like you’re trying to count the number of atoms in some chemical formulas. Here’s the list of the number of each atom in the formulas you provided:

Formula 1: Н - 1 Formula 2: H - 1, O - 1 Formula 3: Н - 14 Formula 4: Н - 2, C - 3 Formula 5: I - 1 Formula 6: Н - 3 Formula 7: H - 2 Formula 8: Н - 2, C - 3, O - 1 Formula 9: Li - 1 Formula 10: Н - 2 Formula 11: Н - 2 Formula 12: H - 1 Formula 13: Н - 2, C - 2, O - 1 Formula 14: II

What is the main reason plants grow fruit?

A
to provide delicious food for humans and other animals

B
to stop animals from spreading seeds

C
to encourage bees to pollinate

D
to keep seeds safe and make them easier to spread

Answers

Answer:

D

Explanation:

to keep seeds safe and make them easier to spread

Answer:

D. to keep seeds safe and make them easier to spread

Explanation:

The main reason plants grow fruit is to aid in the protection and spreading of seeds. The fruit protects the seeds and also helps to spread them. Many fruits are good to eat and attract small animals, such as birds and squirrels, who like to feed on them. The seeds pass through them unharmed and then get spread through their droppings. So, the correct answer would be D.

100 POINTS PLEASE HELP!!! 1. Explain how you would determine the enthalpy of reaction for the hypothetical reaction A2X4(l) + X2(g) → 2AX3(g) using the following information. You do not need to calculate an answer. Respond to the prompt with a minimum response length of 50 words.

Answers

To determine the enthalpy of reaction for the given reaction, use Hess's Law, which states that the total enthalpy change of a reaction is independent of the pathway between the initial and final states.

How to determine the enthalpy of reaction?

Break the given reaction into a series of steps for which the enthalpy changes are known or can be measured experimentally.

Add the enthalpy changes of each step to determine the overall enthalpy change for the reaction.

For example, determine the enthalpy of formation for A₂X₄(l), X₂(g), and AX₃(g) and use them to calculate the enthalpy of reaction for the given equation.

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please provide explanation!! thank you in advance!!

Answers

The molarity of the product is  0.00368 M. Option B

What is the reaction equilibrium?

When the rates of the forward and reverse reactions in a chemical reaction are equal and the concentrations of reactants and products are stable over time, this condition is referred to as reaction equilibrium.

The equilibrium constant is a measure of the relative concentrations of reactants and products at equilibrium.

[tex]Keq = [H_{2} O] [CO]/[H_{2}] [CO_{2} ]\\0.106 = x^2/(0.0113)^2\\x = \sqrt{} 0.106 (0.0113)^2\\x = 0.00368 M[/tex]

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arrange the following electrons, represented by their quantum numbers, in increasing order of energy (lowest written first)

(1,0,0,-1/2); (3,1,1,1/2); (2,1,0,-1/2); (2,1,0,-1/2); (3,2,0,-1/2)

Answers

The electrons can be arranged in increasing order of energy as follows: (1,0,0,-1/2) < (2,1,0,-1/2) < (2,1,0,-1/2) < (3,1,1,1/2) < (3,2,0,-1/2).

The energy of an electron is determined by its principal quantum number (n), azimuthal quantum number (l), magnetic quantum number (m), and spin quantum number (s). The electrons can be arranged in increasing order of energy by comparing their quantum numbers.

Starting with the lowest energy electron, we have the electron with quantum numbers (1,0,0,-1/2). This electron has the lowest principal quantum number, indicating that it occupies the lowest energy level.

It also has an azimuthal quantum number of zero, which corresponds to the s subshell, and a negative spin quantum number, indicating that its spin is aligned opposite to the magnetic field.

Next, we have the two electrons with quantum numbers (2,1,0,-1/2). These electrons have the same principal quantum number, indicating that they occupy the same energy level.

They both have an azimuthal quantum number of one, which corresponds to the p subshell, and a negative spin quantum number.

Following these electrons, we have the electron with quantum numbers (3,1,1,1/2). This electron has a higher principal quantum number than the previous electrons, indicating that it occupies a higher energy level.

It has an azimuthal quantum number of one, which corresponds to the p subshell, and a positive spin quantum number.

Finally, we have the electron with quantum numbers (3,2,0,-1/2). This electron has the highest azimuthal quantum number of all the electrons, indicating that it occupies the d subshell. It also has a negative spin quantum number.

Therefore, the electrons can be arranged in increasing order of energy as follows: (1,0,0,-1/2) < (2,1,0,-1/2) < (2,1,0,-1/2) < (3,1,1,1/2) < (3,2,0,-1/2).

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What is the pH of a solution that has a H+ concentration of 1.9x10-6?

Answers

The pH of the solution is 5.72, which is slightly acidic.

pH is a measure of the acidity or basicity of a solution. It is defined as the negative logarithm of the hydrogen ion concentration (H+) in a solution. The pH scale ranges from 0 to 14, where a pH of 7 is neutral, pH below 7 is acidic, and pH above 7 is basic. The formula to calculate pH is pH = -log[H+], where [H+] represents the concentration of hydrogen ions in moles per liter.
Given the H+ concentration of 1.9x10-6, we can calculate the pH of the solution as follows:
pH = -log(1.9x10-6) = 5.72
It is important to note that pH is an important factor in various chemical and biological processes. It can affect the solubility of certain substances, enzymatic activity, and the growth and survival of living organisms. Maintaining the appropriate pH is crucial for the proper functioning of these processes.

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which one have least PH
a. CH3CH2COOH
b. CH2CLCH2COOH
c. CH3CHCL2COOH
d. CH3CH2CH2COOH

Answers

CH₃CHCl₂COOH is 2,2-dichloropropanoic acid, with the least pH, option (c) is correct.

pH is a measure of the acidity or basicity of a solution. A lower pH indicates a higher acidity. Acidity is due to the presence of hydrogen ions (H⁺) in a solution. The more the concentration of H⁺, the lower the pH. CH₃CH₂COOH is propanoic acid, which has a pH of around 4.9.

CH₂ClCH₂COOH is 2-chloropropanoic acid, which has a pH of around 2.8 due to the electron-withdrawing effect of the chlorine atom. CH₃CH₂CH₂COOH is butanoic acid, which has a pH of around 4.8. Thus, CH₃CHCl₂COOH is 2,2-dichloropropanoic acid, which has the least pH among the given options, around 1.5 due to the presence of two electron-withdrawing chlorine atoms, option (c) is correct.

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Identity the number of bonding pairs and lone pairs of electrons n2

Answers

There are 3 bonding pairs and 7 lone pairs of electrons in N2.

What is an electron

An atom's nucleus is orbited by an electron, a subatomic particle with a negative charge. Along with protons and neutrons, it is one of the elementary particles that make up matter. The mass of an electron is exceedingly small, it is roughly 1/1836 that of a proton.

To determine the number of lone pairs of electrons in N2, we need to subtract the number of bonding pairs from the total number of valence electrons:

Number of lone pairs = Total number of valence electrons - Number of bonding pairs

Number of lone pairs = 10 - 3

Number of lone pairs = 7

Therefore, there are 3 bonding pairs and 7 lone pairs of electrons in N2.

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* For all 3 trials find the moles of KHC8H4O4 using the grams of KHC8H4O4. Show all work!
* Use the mole ratio from question 1 to find the moles of NaOH used. Remember, in a 1:1 ratio if we use 1 mole of KHC8H4O4, then we use 1 mole of NaOH. Record the moles of NaOH used in each trial below.

Trial 1 ________________
Trial 2 ________________
Trial 3 ________________

Answers

At equivalence point, the reaction is seen to consume approximately 0.0024973 moles of KHP and then 0.0024973 moles of  NaOH

How to calculate the mole ratio?

The primary aim in this problem is to standardize a solution of the sodium hydroxide, NaOH, with the aid of potassium hydrogen phthalate, KHP.

The beginning point in this problem is the balanced chemical equation with respect to this neutralization reaction

KHP (aq] + NaOH(aq] → KNaP(aq] + H₂O(l]

The important thing that we are going to observe is that there is a ratio of 1:1 mole ratio between the two reactants. This suggests to us that the equivalence point can be attained by getting equal number of moles of  KHP and of NaOH to react with each other.

We will begin with 0.5100 g of KHP. To obtain the molar amount of acid utilized for the experiment, we will make use of its molar mass of 0.5100g⋅

molar mass of KHP

1 mole KHP 204.22g = 0.0024973 moles KHP

Thus, at equivalence point, the reaction is seen to consume approximately 0.0024973 moles of KHP and then 0.0024973 moles of  NaOH, due to the fact that it's what the  1:1 mole ratio suggests to us.

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7. What is the reason that methemoglobinemia was isolated to Troublesome Creek area of KY? (In other
words why was the disorder only prevalent in KY; why didn't other states see cases like this?)

Answers

Methemoglobinemia was caused by contaminated well water and a genetic predisposition in the population of Troublesome Creek, KY.

Methemoglobinemia was detached to the Problematic Rivulet area of KY in view of the novel blend of ecological variables and hereditary inclination in the populace. The issue was brought about by the utilization of well water polluted with elevated degrees of nitrate and nitrite, which can cause the arrangement of methemoglobin in the blood. The populace in this space was to a great extent slipped from a little gathering of trailblazers who settled there during the 1800s, which might have added to a higher pervasiveness of the hereditary characteristic that inclines people toward the issue. The particular mix of hereditary defenselessness and ecological openness in this populace probably prompted the secluded flare-up of methemoglobinemia around here.

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Question
How many moles of Na₂S₂O3 are needed to dissolve 0.65 mol of AgBr in a solution volume of
1.0 L, if Ksp for AgBris 3.3 x 10-13 and K for the complex ion [Ag(S₂03)2] is 4.7 × 10¹3?
Remember to use correct significant figures in your answer (round your answer to the nearest
tenth). Do not include units in your response.

Answers

The precipitation of an ionic substance from solution occurs when the ionic product exceeds the value of its solubility product at that temperature. Here the moles of Na₂S₂O₃ needed is

The solubility product of a sparingly soluble salt is defined as the product of the molar concentrations of its ions in a saturated solution of it at a given temperature.

Here the concentration of Ag⁺ ions = √Ksp = √3.3 × 10⁻¹³ = 1.81 × 10⁻¹³.

Moles of Ag⁺ ions: (1.82 x 10⁻¹³ M) x 1.0 L = 1.82 x 10⁻¹³  mol Ag⁺

Use the stoichiometry of the reaction to find the moles of Na₂S₂O₃ needed: 1 mol Na₂S₂O₃ / 2 mol Ag⁺ = 0.5 mol Na₂S₂O₃/mol Ag⁺

Moles of Na₂S₂O₃ required: 0.5 mol Na₂S₂O₃/mol Ag⁺ x 1.82 x 10⁻¹³ mol Ag⁺ = 9.1 x 10⁻¹⁴ mol Na₂S₂O₃

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Ethane burns in oxygen according to the following equation: 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
(a) How many liters of O2 at 41 °C and 0.307 atm will be needed to burn 8.57 L of C2H6 at 41 °C and 0.307 atm?
(b) How many liters of CO2 at 41 °C and 0.307 atm will be produced? Report your answers to parts (a) and (b) to 3 significant figures.

Answers

a) We need 32.6 liters of [tex]O_2[/tex] at 41 °C and 0.307 atm to burn 8.57 L of [tex]C_2H_6[/tex]  at 41 °C and 0.307 atm

b) 18.5 liters of [tex]CO_2[/tex] will be produced at 41 °C and 0.307 atm.

To answer this question, we will use the ideal gas law, which relates pressure, volume, temperature, and number of moles of a gas. We will also use stoichiometry to relate the amount of ethane and oxygen consumed and the amount of carbon dioxide and water produced.

(a) To determine how many liters of [tex]O_2[/tex] are needed to burn 8.57 L of [tex]C_2H_6[/tex] , we first need to convert the volume of ethane to moles using the ideal gas law:
n([tex]C_2H_6[/tex] ) = PV/RT = (0.307 atm)(8.57 L)/(0.0821 L·atm/mol·K)(314 K) = 0.342 mol

From the balanced equation, we see that 2 moles of [tex]C_2H_6[/tex] react with 7 moles of [tex]O_2[/tex] . Therefore, the amount of [tex]O_2[/tex] needed is:
n([tex]O_2[/tex]) = (7/2) n([tex]C_2H_6[/tex]) = (7/2)(0.342 mol) = 1.20 mol

Now we can use the ideal gas law again to calculate the volume of [tex]O_2[/tex] needed:
V([tex]O_2[/tex] ) = n([tex]O_2[/tex])RT/P = (1.20 mol)(0.0821 L·atm/mol·K)(314 K)/(0.307 atm) = 32.6 L

Therefore, 32.6 liters of [tex]O_2[/tex] are needed to burn 8.57 L of [tex]C_2H_6[/tex]  at at 41 °C and 0.307 atm

(b) From the balanced equation, we see that 2 moles of [tex]C_2H_6[/tex] produce 4 moles of [tex]CO_2[/tex] . Therefore, the amount of [tex]CO_2[/tex] produced is:

n([tex]CO_2[/tex]) = 2 n([tex]C_2H_6[/tex]) = 2(0.342 mol) = 0.684 mol

V([tex]CO_2[/tex]) = n([tex]CO_2[/tex])RT/P = (0.684 mol)(0.0821 L·atm/mol·K)(314 K)/(0.307 atm) = 18.5 L

Therefore, 18.5 liters of [tex]CO_2[/tex] at 41 °C and 0.307 atm will be produced.

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What mass of oxygen would be released by the thermal decomposition of 918.7 grams of Mercury (II) Oxide?

HgO --> Hg + O2

Answers

Answer:

Explanation:

[tex]\frac{918.7 g}{1} *\frac{1}{216.59m } = 4.241 mol[/tex] To start off the mol of HgO must be found.

After that the molar ratio between HgO and O must be found but in this case its 1:1

[tex]4.241 mol HgO*\frac{1 molO}{1molHgO} = 4.241 mol O[/tex] the mols of HgO is put on the bottom to cancel out  with the other one leaving just mols of oxygen. Finally to find g of oxygen it must be multiplied by its molar mass.

[tex]\frac{4.241 molO}{1} * \frac{15.999 g}{mol} = 67.85 g[/tex] Oxygen

A bag of potato chips is sealed in a factory near seal level. The atmospheric pressure is 99.82 kPa. What is the difference in Pa between the pressure in the bag and the atmospheric pressure?

Answers

The difference in Pa between the pressure in the bag and the atmospheric pressure is 1.505 kPa.

How to obtain the difference in pressure

To obtain the difference in pressure, we first need to know the atmospheric pressure near sea level. This is 760 mm Hg. When we convert this to pascals, we will have,  101.32472 kPa.

Now, the difference in pressure will be obtained by subtracting the atmospheric pressure in the bag from the atmospheric pressure near sea level and this is:

101.32472 kPa -  99.82 kPa

= 1.505 kPa.

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After writing the correct formulas for the reactants and products, the equation is balanced by a. adjusting subscripts to the formula(s). b. adjusting coefficients to the smallest whole-number ratio. c. changing the products formed. d. making the number of reactants equal to the number of products.

Answers

After writing the correct formulas for the reactants and products, the equation is balanced by adjusting coefficients to the smallest whole-number ratio. The correct answer is option b.

Adjusting the coefficients to the smallest whole-number ratio is the process of balancing a chemical equation. Balancing the equation means that the number of atoms of each element on the reactant side must equal the number of atoms of each element on the product side.

The coefficients in front of the formulas of the reactants and products are used to balance the equation. By adjusting the coefficients, you can make sure that the number of atoms of each element is balanced on both sides of the equation. Therefore option b is correct

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A sample of gas is contained in a 245 mL flask at a temperature of 23.5°C. The gas pressure is 37.8 mm Hg. The gas is moved to a new flask, which is then immersed in ice water, and which has a volume of 54 mL. What is the pressure of the gas in the smaller flask at the new temperature?

Answers

The pressure of the gas in the smaller flask at the new temperature is approximately 168.5 mm Hg.

To solve this problem, we can use the combined gas law equation, which relates the initial and final states of a gas sample undergoing changes in pressure, volume, and temperature. The equation is:
[tex]P_1V_1/T_1 = P_2V_2/T_2[/tex]

where [tex]P_1[/tex] and [tex]P_2[/tex] are the initial pressure and final pressure, [tex]V_1[/tex] and [tex]V_2[/tex] are the initial and final volumes, and [tex]T_1[/tex] and [tex]T_2[/tex] are the initial and final temperatures in Kelvin.

[tex]V_1[/tex] = 245 mL
[tex]T_1[/tex] = 23.5°C + 273.15 = 296.65 K
[tex]P_1[/tex] = 37.8 mm Hg
[tex]V_2[/tex] = 54 mL
[tex]T_2[/tex] = 0°C (ice water) + 273.15 = 273.15 K

We need to find [tex]P_2[/tex] . Plug the given values into the equation and solve for [tex]P_2[/tex] :
(37.8 mm Hg * 245 mL) / 296.65 K = (P2 * 54 mL) / 273.15 K

Rearrange the equation to isolate [tex]P_2[/tex] :
[tex]P_2[/tex] = (37.8 mm Hg * 245 mL * 273.15 K) / (296.65 K * 54 mL)
[tex]P_2[/tex] ≈ 168.5 mm Hg
So, the pressure of the gas is approximately 168.5 mm Hg in the smaller flask at the new temperature.

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A 1.5 M solution of HCl has 145 g of HCl dissolved, what is the volume of the solution?

Answers

The volume of the 1.5M solution of HCl solution that has 145g of mass is 2.65L.

How to calculate volume?

The volume of a solution can be calculated by dividing the number of moles by its molar concentration as follows;

Volume = no of moles ÷ molarity

According to this question, a 1.5M solution of HCl has 145g of mass. The number of moles can be calculated as follows:

no of moles = 145g ÷ 36.5g/mol = 3.973 moles

volume of HCl solution = 3.973mol ÷ 1.5M

volume of HCl = 2.65L

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Calculate the amount of energy (in kJ) required to increase the temperature of 255 g of water from 25.2 C to 90.5 C. Specific heat of water is 4.184J/g C.

Answers

Answer:

70.91 kJ

Explanation:

The amount of energy (in kJ) required to increase the temperature of 255 g of water from 25.2 C to 90.5 C can be calculated using the formula:

Q = m * c * ΔT

Where Q is the amount of energy, m is the mass of the substance, c is the specific heat, and ΔT is the change in temperature.

Substituting the given values:

m = 255 g

c = 4.184 J/g C

ΔT = (90.5 - 25.2) C = 65.3 C

Q = 255 g * 4.184 J/g C * 65.3 C

Q = 70905.564 J

Q = 70.91 kJ (rounded to two decimal places)

Therefore, the amount of energy required to increase the temperature of 255 g of water from 25.2 C to 90.5 C is 70.91 kJ.

If an atom loses an electron, what will its resulting charge be?

Answers

Answer:

If an atom loses or gains electrons, it will become a positively or negatively charged particle, called an ion. The loss of one or more electrons results in more protons than electrons and an overall positively charged ion, called a cation.

Hope it helped! :)

A pH of 5 is considered to be neutral

Answers

Answer:

No,a pH of 5 is slightly acidic,not neutral. A pH of 7 is considered neutral

50cm³ of 1.0M hydrochloric acid reacted with excess zinc. i) Write the equation for the reaction. ii) How many mole of aqueous hydrogen ions were present in the acid solution? iii) Calculate the volume of gas evolved at s.t.p. [Molar volume = 22.4 dm³ at s.t.p. of gas].​

Answers

i) The equation for the reaction between hydrochloric acid and zinc is:

[tex]Zn + 2HCl → ZnCl2 + H2[/tex]

ii) n(HCl) = C × V = 1.0M × 0.05 L = 0.05 moles

iii) The volume of gas evolved at STP is 0.544 L or 544 mL.

The concentration of hydrochloric acid is 1.0M, which means that there is 1 mole of hydrochloric acid in 1 liter (1000 cm³) of solution. The volume of the hydrochloric acid used is 50 cm³, which is 0.05 liters.

According to the stoichiometry of the reaction, each mole of hydrochloric acid produces one mole of hydrogen ions, so the number of moles of hydrogen ions in the solution is also 0.05 moles.

The volume of gas evolved can be calculated from the ideal gas law:

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the gas constant (0.0821 L·atm/K·mol), and T is the temperature of the gas in Kelvin. At standard temperature and pressure (STP), the pressure is 1 atm and the temperature is 273 K. The molar volume of a gas at STP is 22.4 L/mol.

From the equation for the reaction, we know that one mole of hydrogen gas is produced for every two moles of hydrochloric acid used. Therefore, the number of moles of hydrogen gas produced is:

n(H2) = 0.5 × n(HCl) = 0.5 × 0.05 moles = 0.025 moles

Using the ideal gas law, we can calculate the volume of hydrogen gas produced at STP:

V(H2) = n(H2) × RT/P = 0.025 mol × 0.0821 L·atm/K·mol × 273 K/1 atm = 0.544 L

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A container of hellum has 4.3 moles of gas in a container with a volume of 3.9 liters and a pressure of 201.6kPa at 298K. A container of xenon has a volume of 3.9 liters
and a pressure of 201.6kPa at 298K. How many moles of xenon gas is present?

Answers

The ideal gas law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin. Rearranging the equation, we get:

n = PV/RT

For the container of helium:

n = (201.6 kPa) x (3.9 L) / [(8.31 J/mol*K) x (298 K)] = 0.0688 mol

Now, using the same equation for the container of xenon:

n = (201.6 kPa) x (3.9 L) / [(8.31 J/mol*K) x (298 K)] = 0.0688 mol

Therefore, there are also 0.0688 moles of xenon gas present in the container.

A sample of an ideal gas has a volume of 3.75 L
at 10.60 ∘C
and 1.80 atm.
What is the volume of the gas at 23.20 ∘C
and 0.990 atm?

Answers

The volume of the gas at 23.20∘C and 0.990 atm is 7.12L.

How to calculate volume?

The volume of a gas can be calculated using the combined gas law equation as follows;

PaVa/Ta = PbVb/Tb

Where;

Pa, Va and Ta = initial pressure, volume and temperature respectively Pb, Vb and Tb = final pressure, volume and temperature respectively

According to this question, a sample of an ideal gas initially has a volume of 3.75 L at 10.60 ∘C and 1.80 atm. The resulting volume can be calculated as follows;

1.8 × 3.75/283.6 = 0.990 × Vb/296.2

0.0238 × 296.2 = 0.990Vb

Vb = 7.0498 ÷ 0.990

Vb = 7.12L

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Which of the following is an example of an environmental impact of
agriculture?
O high use of gold, copper, and silver
O high use of rock supplies
O high use of mineral resources
O high use of water
Ne

Answers

Answer:

B

self explanatory

Explanation:

the answers is B becuase it uses natural sources

Suppose 135 g of NO3- flows into a swamp each day. What volume of N2 would be produced each day at 17.0°C and 1.00 atm if the denitrification process were complete?
____ L of N2
Suppose 135 g of NO3- flows into a swamp each day. What volume of CO2 would be produced each day at 17.0°C and 1.00 atm?
____ L of CO2
Suppose the gas mixture produced by the decomposition reaction is trapped in a container at 17.0°C; what is the density of the mixture assuming Ptotal = 1.00 atm?
____ g/L

Answers

The volume of N2 produced each day is approximately 24.56 L.

How to find the volume of N2

First, let's find the number of moles of NO3- that flow into the swamp each day:

NO3- molar mass = 14.01 (N) + 3 * 16.00 (O) = 62.01 g/mol

135 g / 62.01 g/mol ≈ 2.177 moles of NO3-

In the denitrification process, NO3- is reduced to N2 gas. The balanced equation for denitrification is:

2NO3- → N2 + 3O2

From the stoichiometry of the reaction, we can see that 2 moles of NO3- produce 1 mole of N2. Therefore, the moles of N2 produced each day can be calculated as follows:

moles of N2 = 2.177 moles of NO3- / 2 ≈ 1.0885 moles of N2

Now we can use the ideal gas law equation to find the volume of N2 produced:

PV = nRT

where:

P = Pressure (1.00 atm)

V = Volume (in Liters)

n = Moles of N2 (1.0885 moles)

R = Ideal gas constant (0.0821 Latm/molK)

T = Temperature (17.0°C or 290.15 K)

Solving for the volume of N2:

V = nRT / P

V = (1.0885 moles) * (0.0821 Latm/molK) * (290.15 K) / (1.00 atm)

V ≈ 24.56 L

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What was the effect of the addition of FeCl3 to the sample solution in the dichromate titration? Explain

Answers

[tex]FeCl_3[/tex] is added to ensure all reducing agent is oxidized, indicating endpoint in dichromate titration.

In a dichromate titration,   [tex]FeCl_3[/tex] is frequently added to the example arrangement as a sign of the endpoint. The expansion of [tex]FeCl_3[/tex] to the example arrangement assists with guaranteeing that the lessening specialist has been all oxidized by the potassium dichromate ([tex]K_2Cr_2O_7[/tex] ) arrangement.

[tex]FeCl_3[/tex] responds with any overabundance[tex]K_2Cr_2O_7[/tex]  in the answer for structure a red-earthy colored encourage of[tex]Fe(OH)_3[/tex] , demonstrating that the lessening specialist has been all oxidized. This response is known as a "back-titration" since overabundance[tex]K_2Cr_2O_7[/tex]   is added to the arrangement, trailed by the option of [tex]FeCl_3[/tex] to decide how much unreacted [tex]K_2Cr_2O_7[/tex] .

The response somewhere in the range of [tex]FeCl_3[/tex] and [tex]K_2Cr_2O_7[/tex] can be addressed as:

[tex]6FeCl_3 + K_2Cr_2O_7 + 7H_2SO_4 → 3Fe_2(SO_4)_3 + Cr_2(SO_4)_3 + K_2SO_4 + 7H_2O + 3Cl_2[/tex]

The [tex]FeCl_3[/tex] goes about as a pointer in this response since it responds with the overabundance [tex]K_2Cr_2O_7[/tex] until the decreasing specialist has been all oxidized. As of now, the red-earthy colored encourage of [tex]Fe(OH)_3[/tex]  structures, showing that the endpoint has been reached.

Without the expansion of [tex]FeCl_3[/tex], it would be challenging to precisely decide the endpoint of the titration. The expansion of [tex]FeCl_3[/tex] is important to guarantee that the lessening specialist has been all oxidized and that the endpoint has been reached, considering a more exact assurance of the grouping of the diminishing specialist in the example arrangement.

In outline, the expansion of [tex]FeCl_3[/tex] to the example arrangement in a dichromate titration is significant in light of the fact that it assists with guaranteeing that the decreasing specialist has been all oxidized, considering a more precise assurance of its focus.

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The complete question is -

What is the reason for a dichromate titration, and how does [tex]FeCl_3[/tex]support deciding the endpoint of the titration? Might you at any point give the compound condition to the response somewhere in the range of [tex]FeCl_3[/tex] and [tex]K_2Cr_2O_7[/tex] and make sense of why [tex]FeCl_3[/tex] goes about as a marker in this response?

Pleae answer 2a and 2b

Answers

A chemical interaction between an acid and a base is known as an acid-base reaction.

Thus, These are known as acid-base theories, such as the Brnsted-Lowry acid-base theory, and they offer alternative conceptions of the reaction mechanisms and their application in solving related problems.

When examining acid-base reactions for gaseous or liquid species, or when the acid or basic character may be less obvious, their significance becomes clear.

The relative potency of the conjugated acid-base pair in the salt controls the pH of its solutions when weak acids and bases react. The resulting salt or its solution can be basic, neutral, or acidic. A strong acid and a weak base can combine to generate an acid salt.

Thus, A chemical interaction between an acid and a base is known as an acid-base reaction.

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