If the reaction's measured product has impurities that increase its mass over what it would be if it were pure, higher percent yields than 100% are attainable.
What influences the increase or decrease in % yield?Because the real yield is frequently lower than the theoretical value, percent yield is typically lower than 100%. This may be due to incomplete or conflicting reactions or sample loss during recovery.
What does an increase in yield mean?It implies that interest rates will increase further, yields will increase, and bond prices would decline as a result. So, it is likely that the bond market will continue to see unusually high levels of volatility in the near future.
To know more about percent yields visit:-
brainly.com/question/12704041
#SPJ1
Why are diamonds unevenly distributed on Earth?
Responses
Diamonds are formed in the upper mantle. Only some places on Earth have an upper mantle.
Diamonds are extremely hard. They are formed in rock that is equally as hard and is found only in certain places on Earth because of this.
Diamonds are made from carbon atoms. Carbon is rarely found on Earth’s surface.
Diamonds are carried upward close to the surface through the action of volcanoes. They are found only in areas with current or past volcanic activity.
Only under certain circumstances involving geological processes, such as plate movements and volcanic activity, could diamonds actually originate. Diamonds can only be found in these unique locations.
Are diamonds distributed equally throughout the world?Nonetheless, because of the mantle's comparatively low carbon content, diamonds are extremely rare. Diamonds are also not found in equal amounts around the planet; rather, they are only discovered in significant quantities in very specific geologic settings.
How do diamonds reach the earth's surface?Carbon crystals that develop beneath the Earth's crust are what makeup diamonds. They are exposed to the atmosphere during volcanic eruptions of a unique magma known as kimberlite.
to know more about diamonds here:
brainly.com/question/29775108
#SPJ1
PLS HELP ANWSER THIS QUESTIONS ILL GIVE YOU BRAINLIST PLEASE HELP
How many total atoms are there in 62.5 g
of carbon disulfide ( CS2)?
Total atoms:
The answer is [tex]4.94 x 10^23[/tex] atoms.
To determine the total number of atoms in 62.5 g of carbon disulfide (CS2), we need to use Avogadro's number and the molecular weight of CS2.
The molecular weight of CS2 is:
Carbon atomic weight = 12.01 g/mol
Sulfur atomic weight = 32.06 g/mol
2 sulfur atoms x 32.06 g/mol + 1 carbon atom x 12.01 g/mol = 76.13 g/mol
Now, we can use the formula:
Number of moles = mass ÷ molecular weight
Number of moles of CS2 = 62.5 g ÷ 76.13 g/mol = 0.821 mol
Finally, we can use Avogadro's number, which is[tex]6.022 x 10^23[/tex] atoms per mole, to calculate the total number of atoms in 62.5 g of CS2:
Total atoms = Number of moles × Avogadro's number
Total atoms = 0.821 mol ×[tex]6.022 x 10^23[/tex] atoms/mol
Total atoms =[tex]4.94 x 10^23[/tex] atoms
Therefore, there are approximately[tex]4.94 x 10^23[/tex]atoms in 62.5 g of carbon disulfide (CS2).
To know more about total atoms:
https://brainly.com/question/21710360
HELP ASAP PLSSS I don't get it
Answer:
I believe the answer is 120 degrees Celsius.
Explanation:
−15+135=120
At what temperature can you fully dissolve 140g of NaNO3?
Answer: The solubility of NaNO3 (sodium nitrate) in water increases as temperature increases. Therefore, we need to know the solubility of NaNO3 at different temperatures to determine the temperature at which 140 g of NaNO3 can be fully dissolved in water.
According to the solubility curve for NaNO3, the maximum solubility of NaNO3 in water is approximately 88 g per 100 g of water at 80°C. This means that at 80°C, we can dissolve 88 g of NaNO3 in 100 g of water to make a saturated solution.
To fully dissolve 140 g of NaNO3, we need to dissolve it in a sufficient amount of water that can dissolve at least 140 g of NaNO3. Using a proportion, we can calculate the amount of water required to dissolve 140 g of NaNO3 at 80°C:
88 g NaNO3 / 100 g water = 140 g NaNO3 / x g water
Solving for x, we get:
x = 159.1 g water
This means that at 80°C, we need to dissolve 140 g of NaNO3 in at least 159.1 g of water to make a saturated solution, in which all of the NaNO3 will be dissolved.
Therefore, the temperature at which 140 g of NaNO3 can be fully dissolved in water is approximately 80°C.
Explanation:
A sample of gas at 32.6 torr and 735 K is heated to 1035 K. What is the new pressure of the gas?
Answer: The answer for this question is 45.9.
Explanation: Since there are numbers with different significant figures, the number or numbers that have less significant figures will be the one you round to. In this case, the numbers in the problem are 32.6,735, and 1035. Since we need to find the numbers that have the least significant figures, the numbers 32.6 and 735 have three significant figures while 1035 has 4 significant figures. Since we need to choose the numbers that have the least significant figures, these numbers are 32.6 and 735 since they have three significant figures. Round your answer to three significant figures and you get 45.9 as your answer.
CH3CHCHCHCH3 with two CH3 groups and an OH group attached IUPAC name
The IUPAC name for the given molecule, which has four carbon atoms, one OH group, and two methyl (CH3) groups attached, is:
4-methyl-2-pentanol
What is IUPAC?
It is an international organization that aims to advance the chemical sciences and to contribute to the application of chemistry in the service of humankind.
Identify the longest carbon chain that contains the functional group (OH). In this case, the longest chain has five carbon atoms.
Number the carbon atoms in the chain, starting from the end that is closest to the functional group (OH). In this case, we can number the chain from left to right, so that the OH group is on carbon atom 2.
Identify and name the substituents (groups) attached to the main chain. In this case, there are two methyl (CH3) groups attached to carbon atoms 4 and 5, respectively.
Learn more about IUPAC from given link
https://brainly.com/question/28872356
#SPJ1
Match the following phase changes to their energy flow.
Evaporation
Melting
Freezing
Sublimation
Condensation
Deposition
[Choose]
[Choose]
Energy both absorbed and released
Energy absorbed
No energy flow
Energy released
[Choose]
[Choose]
[Choose ]
[Choose
Whereas freezing, condensation, or deposition are exothermic processes, fusion, vaporisation, and were endothermic processes. Changes in a system's energy occur together every phase transition.
During a phase change, what energy is altered?Potential energy is the type of energy that is transforming during a phase change. Either elevated body temperature (PE increases) and released (PE drops) throughout a phase change will permit the molecules either move apart or join together.
What 4 phase modifications are there?Melting is the process of changing from of the solid to liquid state. freezing: the transformation of a liquid into a solid. The process of evaporation is the change from a liquid to a gas. Condensing: The change from a gaseous to a liquid state.
To know more about exothermic visit:
https://brainly.com/question/4345448
#SPJ1
Define which are endothermic and exothermic
NaOH (s) → NaOH (aq)
NH4Cl (s) → NH4Cl (aq)
CaCl2 (s) → CaCl2 (aq)
HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)
NaCl (s) → NaCl (aq)
Answer: NaOH (s) → NaOH (aq) is an exothermic process because energy is released when solid NaOH dissolves in water to form an aqueous solution.
NH4Cl (s) → NH4Cl (aq) is also an exothermic process for the same reason as NaOH above.
CaCl2 (s) → CaCl2 (aq) is also an exothermic process because energy is released when solid CaCl2 dissolves in water to form an aqueous solution.
HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) is an exothermic process because energy is released as the acid-base reaction occurs and the products are formed.
NaCl (s) → NaCl (aq) is not an endothermic or exothermic process since there is no change in the state of the substance (solid to aqueous solution) and therefore no energy is either absorbed or released.
Explanation: Endothermic and exothermic refer to processes that either require energy to be absorbed or release energy to the surroundings.
In the given reactions, NaOH, NH4Cl, and CaCl2 dissolve in water to form aqueous solutions, and in doing so, they release energy to the surroundings, making these processes exothermic.
The reaction between HCl and NaOH also releases energy as the products are formed, and so it is also exothermic.
However, in the case of NaCl, there is no change in the state of the substance, and so no energy is either absorbed or released, making it neither endothermic nor exothermic.
At a constant temperature and pressure, there are initially 0.6400 moles in a balloon with a volume of 4.00 L. Gas is removed until there is a total of 0.3500 moles. Calculate the volume of the balloon after this change.
The volume of the balloon after the change is approximately 2.19 L. The gas laws behaviour of gases by providing relationships between the temperature, moles, volume and pressure
What is gas law?We can use the combined gas law to solve this problem: (P1V1)/(n1T1) = (P2V2)/(n2T2) where P is the pressure, V is the volume, n is the number of moles, and T is the temperature.
We can assume that the temperature and pressure remain constant, so T1 = T2 and P1 = P2.
Therefore, we can simplify the equation to: (V1/n1) = (V2/n2)
Substituting the given values, we get: (V1/0.6400) = (V2/0.3500)
Solving for V2, we get: V2 = (0.3500/0.6400) * V1 V2 = 0.5469 * V1
The volume of the balloon after the change is 0.5469 times the original volume, or: V2 = 0.5469 * 4.00 L = 2.1876 L
To know more about gas laws visit:-
brainly.com/question/27009857
#SPJ1
What is the Molarity of a 0.5 Liter solution that contains 3.84 moles of NaCI?
SHOW WORK
Answer:
The molarity of a 0.5 L solution that contains 3.84 moles of NaCl is 7.68 M.
Here’s the work: Molarity (M) = moles of solute / liters of solution Substituting the given values into the equation: Molarity (M) = 3.84 moles / 0.5 L = 7.68 M.
A natural gas (CH4) furnace leaks into the room which is at one atmospheric
pressure and 18°C. The flammability limits of methane are approximately 0.5 to
1.6. When this room is closed and leak tight, it would take between 38 – 56 hours
to reach flammability range. What would you predict happens when the same
scenario occurs in a home in the mountains of New Mexico where the atmospheric
pressure is 0.89 atm? Explain in terms of combustible range and relative ratios.
b) Where do you expect to find methane “residues” in a room?
The flammability of natural gas ranges from 5 to 15 percent. This indicates that no combustion would take place in any mixture with a natural gas to air ratio of less than 5% or greater than 15%.
50% LEL methane – what is it?The lowest concentration of a gas at which combustion can occur is known as the LEL. A reading in%LEL measures the percentage of that LEL value. The LEL, for instance, is 5% by volume for methane. Half of that amount, or 2.5% by volume, is 50% LEL.
How do you determine methane's LEL?Divide the unknown concentration by the LEL specified in the NFPA Handbook to determine the LEL of any gas in air.
To know more about flammability visit:-
brainly.com/question/13323225
#SPJ1
A mixture of 7.5 g
CH4
and 7.5 g
Xe
is placed in a container and the total pressure is found to be 0.52 atm
Find the partial pressure of CH4?
.
The partial pressure of CH₄ in the mixture is 0.464 atm.
What is the partial pressure of the CH₄?To find the partial pressure of CH₄ in the mixture, we need to use the following formula:
Partial pressure of CH₄ = Total pressure × mole fraction of CH₄
To calculate the mole fraction of CH₄, we need to first calculate the moles of each gas present in the mixture.
The number of moles can be calculated using the following formula:
moles = mass ÷ molar mass
The molar mass of CH₄ is 16.04 g/mol and the molar mass of Xe is 131.29 g/mol.
Moles of CH₄ = 7.5 g ÷ 16.04 g/mol = 0.467 mol
Moles of Xe = 7.5 g ÷ 131.29 g/mol = 0.057 mol
The total number of moles in the mixture is the sum of the moles of CH₄ and Xe:
Total moles = 0.467 mol + 0.057 mol = 0.524 mol
Now we can calculate the mole fraction of CH₄:
Mole fraction of CH₄ = Moles of CH₄ ÷ Total moles = 0.467 mol ÷ 0.524 mol = 0.891
Finally, we can use the formula for partial pressure to find the partial pressure of CH₄:
Partial pressure of CH₄ = Total pressure × mole fraction of CH₄
Partial pressure of CH₄ = 0.52 atm × 0.891 = 0.464 atm
Learn more about partial pressure here: https://brainly.com/question/19813237
#SPJ1
Calculate the pH of 0.16M Ch3cooh which has ka = 1.74 × 10^ -5 mol dm^-3.
Answer: 2.78
Explanation:
To calculate the pH of 0.16M CH3COOH, we need to use the dissociation constant (Ka) of the acid, which is given as 1.74 × 10^-5 mol dm^-3.
The dissociation of CH3COOH is as follows:
CH3COOH + H2O ↔ CH3COO- + H3O+
The equilibrium constant expression for the dissociation of CH3COOH is:
Ka = [CH3COO-][H3O+] / [CH3COOH]
We can assume that [H3O+] is equal to [CH3COO-] since the acid is weak and will not dissociate completely. Therefore, the equilibrium constant expression can be simplified as:
Ka = [H3O+]^2 / [CH3COOH]
[H3O+]^2 = Ka x [CH3COOH]
[H3O+]^2 = 1.74 × 10^-5 x 0.16
[H3O+]^2 = 2.784 × 10^-6
[H3O+] = √2.784 × 10^-6
[H3O+] = 0.00167 M
Therefore, the pH of the solution can be calculated as:
pH = -log[H3O+]
pH = -log(0.00167)
pH = 2.78
Therefore, the pH of the 0.16M CH3COOH solution is 2.78.
Please does anyone know how to answer these questions?
Given that we don't have the equation mentioned in the question, I will assume that the equation is referred to is the following:
2N2(g) + 5O2(g) → 2N2O5(g)
a) If you start with 2 moles of O2, according to the equation, 5 moles of O2 are needed to react with 2 moles of N2. Therefore, the number of moles of N2O5 created would be (2/5) x 2 = 0.8 moles.
b) If you start with 1 mole of O2, according to the equation, 5/2 moles of O2 are needed to react with 2 moles of N2. Therefore, the number of moles of N2O5 created would be (1/(5/2)) x 2 = 0.4 moles.
c) If you start with 1 mole of N2, according to the equation, 5/2 moles of O2 are needed to react with 2 moles of N2. Therefore, the number of moles of N2O5 created would be (5/2) x 1 = 2.5 moles.
d) If you get 6 moles of N2O5 during your reaction, according to the equation, 2 moles of N2O5 are produced for every 5 moles of O2 used. Therefore, the number of moles of O2 needed would be (5/2) x (6/2) = 7.5 moles.
e) If you get 6 moles of N2O5 during your reaction, according to the equation, 2 moles of N2O5 are produced for every 2 moles of N2 used. Therefore, the number of moles of N2 needed would be (2/2) x (6/2) = 3 moles.
Names: The chemical names for the compounds involved in the equation are:
O2: Oxygen gas
N2: Nitrogen gas
N2O5: Dinitrogen pentoxide gas
Steps
A chemical reaction between nitrogen and oxygen is represented by the balanced chemical equation 2N2(g) + 5O2(g) 2N2O5(g). The quantities of the reactants and products used in this reaction were questioned.
We may use stoichiometry to determine the mole ratio of O2 to N2O5, which will allow us to calculate how many moles of N2O5 is generated when 2 moles of O2 are consumed.
The equation shows that in order to produce 2 moles of N2O5, 5 moles of O2 must react with 2 moles of N2. The result is the production of (2/5) x 2 = 0.8 moles of N2O5.
Similar calculations can be used to determine how many moles of N2O5 are created when 1 mole of O2 or 1 mole of N2 is used.
learn more about moles here
https://brainly.com/question/28330489
#SPJ1
Hydrogen cyanide is a highly poisonous substance that can be prepared by the reaction of methane and ammonia:
CH4 (g) + NH3 (g) → HCN(g) + 3 H2 (g)
What is the heat of reaction at constant pressure? Provide an answer correct to 3 significant figures. Do not use scientific notation or include units to report your answer. You do need to include the sign as a part of your answer.
N2 (g) + 3 H2 (g) → 2 NH3 (g) ΔHrxn = -91.8 kJ;
C(s) + 2 H2 (g) → CH4 (g) ΔHrxn = -74.9 kJ;
2 C(s) + H2 (g) + N2 (g) → 2 HCN(g) ΔHrxn = +270.3 kJ
The heat of reaction at constant pressure when methane is reacted with ammonia to form hydrogen cyanide is 103.6kJ.
Given that Hydrogen cyanide which is a highly poisonous substance can be prepared by the reaction of methane and ammonia as follows:
[tex]CH_4 (g) + NH_3 (g) -- > HCN(g) + 3 H_2 (g)[/tex]
This is obtained through the following steps:
[tex]N_2 (g) + 3 H_2 (g) -- > 2 NH_3 (g)[/tex]; ΔHrxn = -91.8 kJ;
[tex]C(s) + 2 H_2 (g) -- > CH_4 (g)[/tex]; ΔHrxn = -74.9 kJ;
[tex]2 C(s) + H_2 (g) + N_2 (g) -- > 2 HCN(g)[/tex]; ΔHrxn = +270.3 kJ
The heat of reaction at constant pressure is the sum of the individual reactions such that:
[tex]\delta Hrxn = -91.8 kJ + (-74.9 kJ) + (270.3 kJ) = 103.6 kJ[/tex]
The heat of reaction is the total amount of energy released or absorbed when a chemical reaction occurs. It is calculated by adding the enthalpies of the reactants and subtracting the enthalpies of the products. Hence it concludes that when methane and ammonia react to form hydrogen cyanide, 103.6 kJ of energy is released.
To learn more about heat click here https://brainly.com/question/16648056
#SPJ1
25 points!! And i’ll give brainliest!
Asap
1.
100 grams of ethanol were dissolved in 2 kg of water.
Calculate the boiling and freezing points of the formed solution.
2.
80 grams of benzoic acid were dissolved in 800 g of water. Calculate the boiling and freezing points of the formed solution.
To solve both problems, we need to use the equations for calculating boiling point elevation and freezing point depression:
Boiling point elevation: ΔTb = Kb x molality
Freezing point depression: ΔTf = Kf x molality
where:
ΔTb is the boiling point elevation or increase in boiling pointΔTf is the freezing point depression or decrease in freezing pointKb is the molal boiling point elevation constant for the solventKf is the molal freezing point depression constant for the solventmolality is the concentration of the solute in mol/kg of solventFor both problems, we assume that the solute is completely dissolved in the solvent and that the resulting solution is ideal.
First, we need to calculate the molality of the ethanol solution:
molality = moles of solute / mass of solvent in kg
moles of ethanol = 100 g / 46.07 g/mol = 2.17 molmass of water = 2 kg = 2000 gmolality = 2.17 mol / 2 kg = 1.09 mol/kgNext, we need to find the boiling point elevation and freezing point depression:
ΔTb = Kb x molality
ΔTf = Kf x molality
For water, Kb = 0.512 °C/m and Kf = 1.86 °C/m.
ΔTb = 0.512 °C/m x 1.09 mol/kg = 0.558 °C
ΔTf = 1.86 °C/m x 1.09 mol/kg = 2.03 °C
Therefore, the boiling point of the solution is 100 + 0.558 = 100.558 °C, and the freezing point is 0 - 2.03 = -2.03 °C.
2. First, we need to calculate the molality of the benzoic acid solution:
molality = moles of solute / mass of solvent in kg
moles of benzoic acid = 80 g / 122.12 g/mol = 0.655 molmass of water = 800 g = 0.8 kgmolality = 0.655 mol / 0.8 kg = 0.819 mol/kgNext, we need to find the boiling point elevation and freezing point depression:
ΔTb = Kb x molality
ΔTf = Kf x molality
For water, Kb = 0.512 °C/m and Kf = 1.86 °C/m.
ΔTb = 0.512 °C/m x 0.819 mol/kg = 0.419 °C
ΔTf = 1.86 °C/m x 0.819 mol/kg = 1.52 °C
Therefore, the boiling point of the solution is 100 + 0.419 = 100.419 °C, and the freezing point is 0 - 1.52 = -1.52 °C.
More on boiling and freezing points can be found here: https://brainly.com/question/13380426
#SPJ1
Pls help with common naming the benzene aromatic compounds
The name of the substituent is appended as a prefix to the name of the aromatic compound in the IUPAC nomenclature of substituted aromatic compounds. Nitrobenzene is the name given to a benzene ring linked to a one-nitro group.
A level chemistry: how do you name benzene compounds?Aromatic compounds, often known as arenes, are chemicals that include a benzene ring. Arenes can be given two names: Chlorobenzne, benzoic acid (or benzene-carboxylic acid), and 1,3-dimethylbenzene are examples of substituted benzene rings.
Aromatic rings (also known as aromatic compounds or arenes) are hydrocarbons that include benzene or another ring structure similar to benzene.
learn more about Aromatic compounds
https://brainly.com/question/29497803
#SPJ1
Select the options that correctly reflect the mass ratios and mass percentages of the elements in SO3
1. The mass ratio of S is .400
2. The mass percentage of O is 60%
The options "The mass ratio of S is .400 and The mass percentage of O is 60%" , Both are correct of the elements in sulfur trioxide ([tex]SO^3[/tex])
The molecular formula of sulfur trioxide ([tex]SO^3[/tex]) contains one sulfur atom and three oxygen atoms. To calculate the mass ratios and mass percentages of each element in [tex]SO^3\\[/tex], we need to know the atomic masses of sulfur and oxygen:
Sulfur (S): 32.06 g/mol
Oxygen (O): 16.00 g/mol
Mass ratio of S:
The mass ratio of sulfur (S) in [tex]SO^3\\[/tex] is the mass of sulfur divided by the total mass of the compound:
Mass ratio of S = mass of S / (mass of S + mass of O)
Mass ratio of S = [tex]32.06 g/mol / (32.06 g/mol + 3(16.00 g/mol))[/tex]
Mass ratio of S =[tex]32.06 g/mol / 80.06 g/mol[/tex]
Mass ratio of S = 0.400
Therefore, option 1 "The mass ratio of S is .400" is correct.
Mass percentage of O:
The mass percentage of oxygen (O) in [tex]SO^3[/tex] is the mass of oxygen divided by the total mass of the compound, multiplied by 100%:
Mass percentage of O = (mass of O / total mass) x 100%
Mass percentage of O = [tex](3(16.00 g/mol) / (32.06 g/mol + 3(16.00 g/mol))) * 100%[/tex]
Mass percentage of O = [tex]48.00 g/mol / 80.06 g/mol * 100%[/tex]
Mass percentage of O = 59.97%
Rounding to one significant figure, the mass percentage of O in [tex]SO^3\\[/tex] is 60%.
Therefore, option 2 "The mass percentage of O is 60%" is also correct.
For more such questions on sulfur trioxide , Visit:
https://brainly.com/question/30352862
#SPJ11
Add any nonzero formal charges to the atoms as applicable for the lewis structure shown with connectivity c–s–s. all valence electrons have been included, and this structure follows the octet rule. if formal charges are equal to zero, they should not be included.
Carbon would therefore have a formal charge of 0, Sulfur 1 would have a formal charge of 1, and Sulfur 2 would have a formal charge of 1.
How can nonzero formal charge be found?For each atom in a Lewis structure, you should count how many electrons it "owns" in order to get the formal charges. All of its lone pair electrons as well as 50% of its bonding electrons should be counted. The formal charge is the discrepancy between the atom's number of valence electrons and the number it possesses.
Which has an atom's core having no formal charge?For organic chemists, carbon is the most significant element. Four bonds are made to the carbon atom in the structures of methane, methanol, ethane, ethene, and ethyne.
To know more about Carbon visit:-
https://brainly.com/question/22530423
#SPJ1
if the [H+] of a solution is 8.4 x 10-3 mol/L the pOH of the solution is
The pOH of the solution is 10.92.
Calculation-Equation: The relationship between a solution's pH and pOH is:
pH + pOH = 14
where pH is equal to the negative logarithm of the concentration of hydrogen ions (H+), and pOH is equal to the negative logarithm of the concentration of hydroxide ions (OH-).
We must first determine the [OH-] concentration to determine the solution's pOH. We can apply the following:
Kw = [H+][OH-] = 1.0 x 10^-14 at 25°C
where Kw is the water-specific ion product constant.
If we rewrite this equation, we obtain:
[OH-] = Kw/[H+] = 1.0 x 10^-14 / 8.4 x 10^-3 = 1.19 x 10^-11 mol/L
We can now calculate pOH's value using the definition of the term:
pOH = -log[OH-] = -log(1.19 x 10^-11) = 10.92
to know more about the solution here:
brainly.com/question/30665317
#SPJ1
3. A student obtained the following data using the procedure used in this experiment.
BEFORE IGNITION
mass of crucible + crucible cover = 34.12 g
mass of crucible + cover + unknown sample = 36.65 g
AFTER IGNITION
mass of crucible + cover + unknown (1st weighing) = 35.67 g
mass of crucible + cover + unknown (2nd weighing) = 35.23 g
mass of crucible + cover + unknown (3rd weighing) = 35.20 g
Calculate the % water in the unknown sample:_______?
The percent of water in the unknown sample is calculated as 57.3%.
What is ignition?Process of providing energy that is required to initiate a combustion process is called ignition.
mass of crucible + cover + unknown sample = 36.65 g
mass of crucible + cover = 34.12 g
mass of unknown sample = (36.65 g - 34.12 g) = 2.53 g
mass of water lost during ignition:
mass of unknown sample (before ignition) = 2.53 g
mass of unknown sample (after 1st weighing) = 35.67 g - 34.12 g = 1.55 g
mass of unknown sample (after 2nd weighing) = 35.23 g - 34.12 g = 1.11 g
mass of unknown sample (after 3rd weighing) = 35.20 g - 34.12 g = 1.08 g
total mass of water lost during ignition = (2.53 g - 1.08 g) = 1.45 g
As % water in unknown sample = (mass of water lost / mass of unknown sample) x 100%
= (1.45 g / 2.53 g) x 100%
% water in unknown sample = 57.3%
Therefore, percent of water in the unknown sample is 57.3%.
To know more about ignition, refer
https://brainly.com/question/28270114
#SPJ1
Iron reacts with oxygen gas to form a mixture of FeO and Fe₂O₃ when the supply of oxygen is regulated. A sample of 20.00 g iron metal reacts with oxygen gas to form 27.55 g iron oxide mixture, and all of the iron metal was consumed. What is the mass in g of FeO that were produced in the mixture?
The mass in of [tex]FeO[/tex] that were produced in the mixture is 8.49g when a sample of 20.00 g iron metal reacts with oxygen gas to form 27.55 g iron oxide mixture.
Given the mass of iron metal = 20.00g
The mass of iron oxide = 27.55g
Iron reacts with oxygen gas to form a mixture of [tex]FeO[/tex] and [tex]Fe2O3[/tex].
The reaction is as follows: [tex]3Fe + 2O2 --- > FeO + Fe2O3[/tex]
The mass of [tex]FeO[/tex] produced in the mixture can be determined using the following equation:
Mass of [tex]FeO[/tex] = Mass of Iron Oxide Mixture – Mass of [tex]Fe2O3[/tex]
Mass of [tex]FeO[/tex] = 27.55 g - Mass of [tex]Fe2O3[/tex]
as we can see from reaction that 3 moles of iron react to give 1 mole of [tex]Fe2O3[/tex] and 1 mole of [tex]FeO[/tex].
The molar mass of Fe (iron) is = 55.85g/mole and molar mass of [tex]Fe2O3[/tex] = 159.69g/mole
3 * 55.85g of Fe produces 1 * 159.69g of [tex]Fe2O3[/tex]
Then 20.00g of iron produces = 20 * 159.69/3 * 55.85 = 19.06g of [tex]Fe2O3[/tex]
Hence mass of [tex]FeO[/tex] produced = 27.55 - 19.06 = 8.49g
To learn more about molar mass click here https://brainly.com/question/22997914
#SPJ1
HELP
If you measured out 49.93 mL of a 1.000 M sodium hydroxide solution, how many moles of sodium hydroxide would be present?
Answer: 0.0499 moles of sodium hydroxide
Explanation:
We can determine the number of moles by using the Molarity equation:
Molarity = Moles / Volume (volume is always in Liters)
We have 2 out of 3 components of this equation
Molarity = 1.000 M
Volume = 49.93 mL / 1000 = 0.0499 L
So we rearrange the equation like the following:
Moles = Molarity x volume
= 1.000 Mx 0.0499 L
= 0.0499 moles of sodium hydroxide
What variables are plotted on the x and y axes of the graph
Answer:
The Axes. The independent variable belongs on the x-axis (horizontal line) of the graph and the dependent variable belongs on the y-axis (vertical line). The x and y axes cross at a point referred to as the origin, where the coordinates are (0,0).Question 7 of 10
When naming a molecule, how do you indicate that the carbons on either side
of the double bond are pointing in opposite directions?
OA. Use the prefix cis-.
OB. Use the prefix methyl-.
OC. Use the number 2 as a prefix.
OD. Use the prefix trans-.
Answer:
by using the prefix trans
Explanation:
i hope you find it helpful
Calculate the hydronium ion concentration, [H3O+] , for a solution with a pH of 10.68 . [H3O+]= M
We know that pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance which is defined as the negative base 10 logarithm of the activity of hydrogen ions. Which states -
pH= - log [H⁺]= - log [H₃O⁺]As per question, we are given a pH value which is 10.68 for a solution and have asked to find out the hydronium ion concentration. Since we have the value of pH, so we can put into the formula and solve for [H₃O⁺] -
[tex] \:\:\:\:\:\:\longrightarrow \sf pH = 10.68\\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf - log [H₃O⁺] = 10.68 \\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf [H₃O⁺] = 10^{-10.68}\\[/tex]
[tex] \:\:\:\:\:\:\longrightarrow \sf \underline{[H₃O⁺] = 2.0893 \times 10^{-11}\:M} \\[/tex]
Therefore, the hydronium concentration for the solution is [tex]\underline{\: \sf 2.0893 \times 10^{-11}\:M }\\[/tex]
ingitis, but, it also occurs when bacteria dir eninges. This may be caused by an ear or sinus infection and or s Define the term meningitis. 1 2 Mention SIX typical complications of meningitis. List FOUR signs and symptoms of meningitis. Discuss THREE steps of treating a person with meningitis Mention the TWO types of meningitis. right reserved TO
Meningitis is an inflammation of the meninges, which are the membranes that cover the brain and spinal cord. It can be caused by a bacterial or viral infection, with bacterial meningitis being the most serious and potentially life-threatening form.
What are Some common complications of meningitis?Septicemia: This is a serious bloodstream infection that can occur as a result of meningitis. It can cause organ failure and can be fatal.
Brain swelling: Meningitis can cause the brain to swell, which can lead to increased pressure inside the skull and can cause damage to brain tissue.
Hearing loss: Meningitis can damage the inner ear and cause hearing loss, which can be permanent.
Vision loss: In some cases, meningitis can cause damage to the optic nerve and lead to vision loss.
Cognitive impairment: Meningitis can cause long-term cognitive impairment, including problems with memory, attention, and other cognitive functions.
Seizures: Meningitis can cause seizures, which are sudden and uncontrolled bursts of electrical activity in the brain.
Some common signs and symptoms of meningitis include:
Headache
Stiff neck
Fever
Nausea and vomiting
The treatment of meningitis typically involves three main steps:
Antibiotics or antiviral medications: Depending on the cause of the infection, antibiotics or antiviral medications may be prescribed to fight the infection.
Supportive care: This may include medications to reduce fever and pain, as well as intravenous fluids to prevent dehydration.
Hospitalization: Most cases of meningitis require hospitalization for close monitoring and treatment.
Conclusively, there are two main types of meningitis: bacterial meningitis and viral meningitis. Bacterial meningitis is more severe and can be life-threatening if not treated promptly, while viral meningitis is typically less severe and often resolves on its own without treatment.
Learn more about meningitis from
https://brainly.com/question/30469777
#SPJ1
Write the molecular equation and net ionic equation for the reaction of hydroiodic acid and potassium hydroxide. Include phases (states). Enter the formula for water as H2O
find the molar equation and net ionic equation.
The Molecular Equation is : [tex]HI (aq) + KOH (aq) \rightarrow KI (aq) + H_2O (l)[/tex]
The Net Ionic Equation is : [tex]H^+(aq) + OH^-(aq) \rightarrow H_2O(l)[/tex]
This reaction is an acid-base neutralization reaction. Hydroiodic acid (HI) is an acid and potassium hydroxide (KOH) is a base. When the two react, they form water ([tex]H_2O[/tex]) and potassium iodide (KI).[tex]H_2O[/tex] is a chemical formula for water, which consists of two hydrogen atoms and one oxygen atom. Water is a fundamental component of life and is essential for all forms of life on Earth. The reaction is a double displacement reaction, where the positively charged cations, potassium (K⁺) and hydrogen (H⁺), switch places with each other in the reactants to form the products.
It is possible to describe the as:
[tex]HI (aq) + KOH (aq) \rightarrow KI (aq) + H_2O (l)[/tex]
One way to express the net-ionic equation is as follows:
[tex]H^+(aq) + OH^-(aq) \rightarrow H_2O(l)[/tex]
learn more about molecular equation refer:brainly.com/question/14286552
#SPJ1
Consider the cis and trans structures of 1,5 dimethyl decline.which one will be more stable?..
Explanation:
In the case of trans-decalin, there is no steric interaction between the rings because they are at their maximum distance. As a result, the trans conformation is more stable. Another reason is that trans-decalin does not undergo ring flipping. So, it remains rigid and is more stable.
Stearic interactions between the two rings result in a less stable conformation in case of cis-decalin.It undergoes ring flipping so, unstable conformation. (The First image)
Hence, trans-decalin is more stable than cis-decalin.(The second image)
Hopefully this helps! :)