Question 1

An unknown gas with a mass of 4.52 g was found to occupy a volume of 875 mL at 1.69 atm and 65 °C. What is the molecular weight of this gas?

Accepted Answer

MM = mRT/PV = (4.52 ...

Question 2

The barometric pressure in the eye of a hurricane sometimes dips as low as 27.2 inches mercury. How many millimeters of mercury is this?

Accepted Answer

A)   1.1 mm Hg
B)   6.9 mm Hg
C)   691 mm Hg
D)   107 mm Hg

Question 3

Gay-Lussac's law of combining volumes states that the volumes of gases involved in a chemical reaction are in the same ratio as the coefficients for these gases in the balanced equation for the reaction provided that ________.

Accepted Answer

A)   all volumes are measured in liters
B)   all volumes are measured at the same temperature and pressure
C)   all the gases have molecules that contain the same number of atoms
D)   all the gases form diatomic molecules

Question 4

A 2.50 L sample of helium gas has a pressure of 0.925 atm. Calculate the pressure of the gas if the volume is reduced to 0.350 L at constant temperature.

Accepted Answer

A)   0.130 atm
B)   0.946 atm
C)   6.61 atm
D)   0.661 atm

Question 5

The molar volume of a gas is the volume occupied at STP by ________.

Accepted Answer

A)   22,400 mL of gas
B)   760 L of gas
C)   22.41 g of gas
D)   6.02 x 1023 g of gas

Question 6

0.2050 g of a liquid was added to an Erlenmeyer flask. The temperature inside the flask was 35.°C. The volume of the flask was 125 mL. The molecular weight of the liquid was 44.0 g/mole. Calculate the pressure inside the flask in mm Hg.

Accepted Answer

A)   460 mm Hg
B)   58.1 mm Hg
C)   717 mm Hg
D)   1.40 x 103 mm Hg

Question 7

Indicate what the missing words are in the following statement of Boyle's law: At constant temperature, the volume of a gas sample is ________ proportional to its ________.

Accepted Answer

A)   directly, gas constant
B)   directly, pressure
C)   inversely, mass
D)   inversely, pressure

Question 8

A mixture of 8.95 g of Cl2 and 18.0 g of NO2 and an undetermined amount of SO2 occupies a volume of 22.4 liters at 760 mm Hg and 0 °C. How many moles of SO2 are present?

Accepted Answer

A)   1.06 moles
B)   2.77 moles
C)   0.381 moles
D)   0.483 moles

Question 9

The density of a gaseous chlorofluorocarbon (CFC)  at 23.8 °C and 432 mmHg is 3.23 g/L. What is its molar mass?

Accepted Answer

A)   0.182 g/mol
B)   139 g/mol
C)   11.1 g/mol
D)   0.0146 g/mol

Question 10

A gas has a volume of 225 mL at a pressure of 162.5 torr. What is the pressure (in atm) if the volume is decreased to 45 mL?

Accepted Answer

P₂ = P₁V₁/V₂ = (162.5 to...

Question 11

Calculate the density of butane (C4H10)  in grams per liter at STP conditions.

Accepted Answer

A)   0.822 g/L
B)   2.60 g/L
C)   3.79 g/L
D)   5.48 g/L

Question 12

A cylinder of oxygen gas has a pressure of 6.00 atm at 25.0 °C. What is the pressure of the gas at 0.0 °C?

Accepted Answer

A)   5.50 atm
B)   6.55 atm
C)   2.40 atm
D)   15.0 atm

Question 13

Which of the following is a correct expression for the molecular mass of a gas?

Accepted Answer

A)   
B)   
C)   
D)

Question 14

Monochloroethylene is used to make polyvinylchloride (PVC). It has a density of 2.56 g/L at 22.8 °C and 756 mmHg. What is the molar mass of monochloroethylene?

Accepted Answer

MW = <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> = <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> =...

Question 15

Propane burners are used by campers for cooking purposes while in the wild. What volume of H2O gas is produced by the complete combustion of 1.8 L of propane (C3H8)  gas? All gas volumes are measured at the same temperature and pressure.
C3H8(g)  + 5 O2(g)   →\rightarrow→  3 CO2(g)  + 4 H2O(g)

Accepted Answer

A)   1.8 L
B)   14 L
C)   7.2 L
D)   0.52 L

Question 16

A 0.50 L cylinder contains 0.820 grams of an unknown gas. The pressure inside the cylinder is 2.50 atmospheres at 25.0 °C. What is the identity of the unknown gas?

Accepted Answer

A)   28.0 g/mol, N2
B)   2.02 g/mol, H2
C)   16.0 g/mol, CH4
D)   38.0 g/mol, F2

Question 17

If the volume of a sample of chlorine gas is reduced by 1/3 at constant pressure, what happens to its absolute temperature?

Accepted Answer

A)   It remains constant.
B)   It decreases by 1/3.
C)   It triples.
D)   It increases nine-fold.

Question 18

At STP the volume of HCl that will result from the reaction of 0.680 L of H2 and 0.750 L of Cl2 is ________.
H2(g)  + Cl2(g)   →\rightarrow→  2 HCl(g)

Accepted Answer

A)   0.680 L
B)   0.750 L
C)   1.36 L
D)   0.340 L

Question 19

The temperature, in °C, occupied by 0.643 moles of O2 gas at 0.893 atm pressure and a volume of 14.7 L is ________.

Accepted Answer

A)   16 °C
B)   -24 °C
C)   48 °C
D)   318 °C

Question 20

The combined gas law cannot be written as ________.

Accepted Answer

A)   
B)   
C)   
D)

Exam 12: Gas Laws

The combined gas law cannot be written as ________.

Correct Answer
verified

At STP the volume of HCl that will result from the reaction of 0.680 L of H₂ and 0.750 L of Cl₂ is ________. H₂(g) + Cl₂(g) $\rightarrow$ 2 HCl(g)

Correct Answer
verified

Calculate the density of butane (C₄H₁₀) in grams per liter at STP conditions.

Correct Answer
verified

Indicate what the missing words are in the following statement of Boyle's law: At constant temperature, the volume of a gas sample is proportional to its .

Correct Answer
verified

A gas has a volume of 225 mL at a pressure of 162.5 torr. What is the pressure (in atm) if the volume is decreased to 45 mL?

Correct Answer
verified
P₂ = P₁V₁/V₂ = (162.5 to...
View Answer

If the volume of a sample of chlorine gas is reduced by 1/3 at constant pressure, what happens to its absolute temperature?

Correct Answer
verified

An unknown gas with a mass of 4.52 g was found to occupy a volume of 875 mL at 1.69 atm and 65 °C. What is the molecular weight of this gas?

Correct Answer
verified
MM = mRT/PV = (4.52 ...
View Answer

A cylinder of oxygen gas has a pressure of 6.00 atm at 25.0 °C. What is the pressure of the gas at 0.0 °C?

Correct Answer
verified

Gay-Lussac's law of combining volumes states that the volumes of gases involved in a chemical reaction are in the same ratio as the coefficients for these gases in the balanced equation for the reaction provided that ________.

Correct Answer
verified

0.2050 g of a liquid was added to an Erlenmeyer flask. The temperature inside the flask was 35.°C. The volume of the flask was 125 mL. The molecular weight of the liquid was 44.0 g/mole. Calculate the pressure inside the flask in mm Hg.

Correct Answer
verified

The molar volume of a gas is the volume occupied at STP by ________.

Correct Answer
verified

The density of a gaseous chlorofluorocarbon (CFC) at 23.8 °C and 432 mmHg is 3.23 g/L. What is its molar mass?

Correct Answer
verified

Monochloroethylene is used to make polyvinylchloride (PVC). It has a density of 2.56 g/L at 22.8 °C and 756 mmHg. What is the molar mass of monochloroethylene?

Correct Answer
verified
MW = = =...
View Answer

Correct Answer
verified

The barometric pressure in the eye of a hurricane sometimes dips as low as 27.2 inches mercury. How many millimeters of mercury is this?

Correct Answer
verified

A 2.50 L sample of helium gas has a pressure of 0.925 atm. Calculate the pressure of the gas if the volume is reduced to 0.350 L at constant temperature.

Correct Answer
verified

A mixture of 8.95 g of Cl₂ and 18.0 g of NO₂ and an undetermined amount of SO₂ occupies a volume of 22.4 liters at 760 mm Hg and 0 °C. How many moles of SO₂ are present?

Correct Answer
verified

A 0.50 L cylinder contains 0.820 grams of an unknown gas. The pressure inside the cylinder is 2.50 atmospheres at 25.0 °C. What is the identity of the unknown gas?

Correct Answer
verified

Which of the following is a correct expression for the molecular mass of a gas?

Correct Answer
verified

The temperature, in °C, occupied by 0.643 moles of O₂ gas at 0.893 atm pressure and a volume of 14.7 L is ________.

Correct Answer
verified

Exam 12: Gas Laws

The combined gas law cannot be written as ________.

Correct AnswerverifiedShow Answer

At STP the volume of HCl that will result from the reaction of 0.680 L of H2 and 0.750 L of Cl2 is ________. H2(g) + Cl2(g) →\rightarrow→ 2 HCl(g)

Correct AnswerverifiedShow Answer

Calculate the density of butane (C4H10) in grams per liter at STP conditions.

Correct AnswerverifiedShow Answer

Indicate what the missing words are in the following statement of Boyle's law: At constant temperature, the volume of a gas sample is ________ proportional to its ________.

Correct AnswerverifiedShow Answer

A gas has a volume of 225 mL at a pressure of 162.5 torr. What is the pressure (in atm) if the volume is decreased to 45 mL?

Correct AnswerverifiedP2 = P1V1/V2 = (162.5 to...View AnswerShow Answer

If the volume of a sample of chlorine gas is reduced by 1/3 at constant pressure, what happens to its absolute temperature?

Correct AnswerverifiedShow Answer

An unknown gas with a mass of 4.52 g was found to occupy a volume of 875 mL at 1.69 atm and 65 °C. What is the molecular weight of this gas?

Correct AnswerverifiedMM = mRT/PV = (4.52 ...View AnswerShow Answer

A cylinder of oxygen gas has a pressure of 6.00 atm at 25.0 °C. What is the pressure of the gas at 0.0 °C?

Correct AnswerverifiedShow Answer

Gay-Lussac's law of combining volumes states that the volumes of gases involved in a chemical reaction are in the same ratio as the coefficients for these gases in the balanced equation for the reaction provided that ________.

Correct AnswerverifiedShow Answer

0.2050 g of a liquid was added to an Erlenmeyer flask. The temperature inside the flask was 35.°C. The volume of the flask was 125 mL. The molecular weight of the liquid was 44.0 g/mole. Calculate the pressure inside the flask in mm Hg.

Correct AnswerverifiedShow Answer

The molar volume of a gas is the volume occupied at STP by ________.

Correct AnswerverifiedShow Answer

The density of a gaseous chlorofluorocarbon (CFC) at 23.8 °C and 432 mmHg is 3.23 g/L. What is its molar mass?

Correct AnswerverifiedShow Answer

Monochloroethylene is used to make polyvinylchloride (PVC). It has a density of 2.56 g/L at 22.8 °C and 756 mmHg. What is the molar mass of monochloroethylene?

Correct AnswerverifiedMW = = =...View AnswerShow Answer

Propane burners are used by campers for cooking purposes while in the wild. What volume of H2O gas is produced by the complete combustion of 1.8 L of propane (C3H8) gas? All gas volumes are measured at the same temperature and pressure. C3H8(g) + 5 O2(g) →\rightarrow→ 3 CO2(g) + 4 H2O(g)

Correct AnswerverifiedShow Answer

The barometric pressure in the eye of a hurricane sometimes dips as low as 27.2 inches mercury. How many millimeters of mercury is this?

Correct AnswerverifiedShow Answer

A 2.50 L sample of helium gas has a pressure of 0.925 atm. Calculate the pressure of the gas if the volume is reduced to 0.350 L at constant temperature.

Correct AnswerverifiedShow Answer

A mixture of 8.95 g of Cl2 and 18.0 g of NO2 and an undetermined amount of SO2 occupies a volume of 22.4 liters at 760 mm Hg and 0 °C. How many moles of SO2 are present?

Correct AnswerverifiedShow Answer

A 0.50 L cylinder contains 0.820 grams of an unknown gas. The pressure inside the cylinder is 2.50 atmospheres at 25.0 °C. What is the identity of the unknown gas?

Correct AnswerverifiedShow Answer

Which of the following is a correct expression for the molecular mass of a gas?

Correct AnswerverifiedShow Answer

The temperature, in °C, occupied by 0.643 moles of O2 gas at 0.893 atm pressure and a volume of 14.7 L is ________.

Correct AnswerverifiedShow Answer

Correct Answer
verified

At STP the volume of HCl that will result from the reaction of 0.680 L of H₂ and 0.750 L of Cl₂ is ________. H₂(g) + Cl₂(g) $\rightarrow$ 2 HCl(g)

Correct Answer
verified

Calculate the density of butane (C₄H₁₀) in grams per liter at STP conditions.

Correct Answer
verified

Indicate what the missing words are in the following statement of Boyle's law: At constant temperature, the volume of a gas sample is proportional to its .

Correct Answer
verified

Correct Answer
verified
P₂ = P₁V₁/V₂ = (162.5 to...
View Answer

Correct Answer
verified

Correct Answer
verified
MM = mRT/PV = (4.52 ...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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MW = = =...
View Answer

Correct Answer
verified

Correct Answer
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Correct Answer
verified

A mixture of 8.95 g of Cl₂ and 18.0 g of NO₂ and an undetermined amount of SO₂ occupies a volume of 22.4 liters at 760 mm Hg and 0 °C. How many moles of SO₂ are present?

Correct Answer
verified

Correct Answer
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Correct Answer
verified

The temperature, in °C, occupied by 0.643 moles of O₂ gas at 0.893 atm pressure and a volume of 14.7 L is ________.

Correct Answer
verified