Question 1

If 2.38 mol of a gas has a volume of 120.0 mL,what is the volume of 1.97 mol of the gas at the same temperature and pressure?

Accepted Answer

A)  25.6 mL
B)  99.3 mL
C)  119 mL
D)  145 mL
E)  563 mL

Question 2

A fixed quantity of gas,initially at 600ºC,undergoes a temperature change at constant pressure in a cylinder with a movable piston.What final temperature of the gas can result in the change of state depicted below?

Accepted Answer

A)  1473ºC
B)  1200ºC
C)  600ºC
D)  300ºC
E)  163ºC

Question 3

Which figure best represents the concept of pressure? (A sphere represents a gaseous atom.)

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 4

A sample of gas occupies 24.5 L at a pressure of 1.57 atm.What is the pressure if the volume is increased to 48.3 L at constant temperature?

Accepted Answer

A)  0.796 atm
B)  1.26 atm
C)  3.10 atm
D)  5.38 × 10-4 atm
E)  1.86 × 103 atm

Question 5

What is the formula which describes the relationship between the pressure,volume,temperature,and moles?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 6

The catalytic decomposition of hydrogen peroxide yields oxygen gas and water.In an experiment,decomposition of hydrogen peroxide yielded 75.3 mL of gas collected over water at 25°C and 742 torr.What mass of oxygen gas was collected? (Pwater = 24 torr at 25°C,R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  0.00291 g
B)  0.0931 g
C)  0.0962 g
D)  0.0993 g
E)  0.962 g

Question 7

Arrange the following gases in order of increasing rate of effusion: C2H6,Ar,HCl,and PH3.

Accepted Answer

A)  Ar < HCl<PH3 < C2H6
B)  C2H6 < PH3 < HCl < Ar
C)  Ar < PH3 < C2H6 < HCl
D)  C2H6 < HCl < PH3 < Ar
E)  Ar < PH3 < HCl < C2H6

Question 8

A sample of a gas occupies 1.40 L at 25°C and 760 mmHg.What volume will it occupy at the same temperature and 380 mmHg?

Accepted Answer

A)  2.8 L
B)  2.10 L
C)  1.40 L
D)  1.05 L
E)  0.700 L

Question 9

Select the gas with the highest average kinetic energy per mole at 298 K.

Accepted Answer

A)  O2
B)  CO2
C)  H2O
D)  H2
E)  All have the same average kinetic energy.

Question 10

What is the formula which describes the relationship between the volume and number of moles in the sample at constant pressure and constant temperature?

Accepted Answer

A)  Vn = k3
B)  V2 /n = k3
C)  n/V2 = k3
D)  V/n = k3
E)  V = -k3n

Question 11

What is the volume of NH3 produced in the following reaction when 3.0 L of N2 reacts with 4.0 L of H2 ?
N2(g) + 3H2(g) → 2NH3(g)

Accepted Answer

A)  1.5 L
B)  2.7 L
C)  6.0 L
D)  7.5 L
E)  12 L

Question 12

Determine the molar mass of Freon-11 gas if a sample weighing 0.597 g occupies 100 cm3 at 95°C and 1000 mmHg (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg) .

Accepted Answer

A)  0.19 g/mol
B)  35.3 g/mol
C)  70.9 g/mol
D)  137 g/mol
E)  384 g/mol

Question 13

If 25.5 L of oxygen are cooled from 150°C to 50°C at constant pressure,what is the new volume of oxygen?

Accepted Answer

A)  0.0514 L
B)  19.5 L
C)  33.4 L
D)  0.03 L
E)  3.5 L

Question 14

What is the molar mass of an unknown gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm3 at 97°C and at a pressure of 728 mmHg? (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg) .

Accepted Answer

A)  187 g/mol
B)  121 g/mol
C)  112 g/mol
D)  31.6 g/mol
E)  8.28 × 10-3 g/mol

Question 15

"The volume of an ideal gas is directly proportional to the number of moles of the gas at constant temperature and pressure" is a statement of _____________ law.

Accepted Answer

A)  Charles's
B)  Boyle's
C)  Dalton's
D)  Avogadro's
E)  Gay-Lussac's

Question 16

A sample of N2 gas occupies 2.40 L at 20°C.At what temperature will the N2 gas occupy a volume of 4.80 L at constant pressure?

Accepted Answer

A)  10°C
B)  40°C
C)  146°C
D)  313°C
E)  586°C

Question 17

A(n)___________ is an instrument used to measure the atmospheric pressure.

Accepted Answer

The answer of A(n)___________ is an instrument used to measure...

Question 18

Which statement is false?

Accepted Answer

A)  The average kinetic energies of molecules from samples of different "ideal" gases are the same at the same temperature.
B)  The molecules of an ideal gas are relatively far apart.
C)  All molecules of an ideal gas have the same kinetic energy at constant temperature.
D)  Molecules of a gas undergo many collisions with each other and the container walls.
E)  Molecules of greater mass have a lower average speed than those of less mass at the same temperature.

Question 19

For a substance that remains a gas under the conditions listed,deviation from the ideal gas law would be most pronounced at

Accepted Answer

A)  100°C and 2.0 atm.
B)  0°C and 2.0 atm.
C)  -100°C and 2.0 atm.
D)  -100°C and 4.0 atm.
E)  100°C and 4.0 atm.

Question 20

A sample of nitrogen gas has a volume of 32.4 L at 20°C.The gas is heated to 220ºC at constant pressure.What is the final volume of the nitrogen gas?

Accepted Answer

A)  2.94 L
B)  19.3 L
C)  32.4 L
D)  54.5 L
E)  356 L

Exam 10: Gases

A sample of nitrogen gas has a volume of 32.4 L at 20°C.The gas is heated to 220ºC at constant pressure.What is the final volume of the nitrogen gas?

Correct AnswerverifiedShow Answer

If 25.5 L of oxygen are cooled from 150°C to 50°C at constant pressure,what is the new volume of oxygen?

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What is the molar mass of an unknown gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm3 at 97°C and at a pressure of 728 mmHg? (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg) .

Correct AnswerverifiedShow Answer

Select the gas with the highest average kinetic energy per mole at 298 K.

Correct AnswerverifiedShow Answer

Which figure best represents the concept of pressure? (A sphere represents a gaseous atom.)

Correct AnswerverifiedShow Answer

A sample of a gas occupies 1.40 L at 25°C and 760 mmHg.What volume will it occupy at the same temperature and 380 mmHg?

Correct AnswerverifiedShow Answer

A(n)___________ is an instrument used to measure the atmospheric pressure.

Correct AnswerverifiedShow Answer

A sample of gas occupies 24.5 L at a pressure of 1.57 atm.What is the pressure if the volume is increased to 48.3 L at constant temperature?

Correct AnswerverifiedShow Answer

For a substance that remains a gas under the conditions listed,deviation from the ideal gas law would be most pronounced at

Correct AnswerverifiedShow Answer

If 2.38 mol of a gas has a volume of 120.0 mL,what is the volume of 1.97 mol of the gas at the same temperature and pressure?

Correct AnswerverifiedShow Answer

What is the formula which describes the relationship between the pressure,volume,temperature,and moles?

Correct AnswerverifiedShow Answer

What is the volume of NH3 produced in the following reaction when 3.0 L of N2 reacts with 4.0 L of H2 ? N2(g) + 3H2(g) → 2NH3(g)

Correct AnswerverifiedShow Answer

What is the formula which describes the relationship between the volume and number of moles in the sample at constant pressure and constant temperature?

Correct AnswerverifiedShow Answer

Determine the molar mass of Freon-11 gas if a sample weighing 0.597 g occupies 100 cm3 at 95°C and 1000 mmHg (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg) .

Correct AnswerverifiedShow Answer

A fixed quantity of gas,initially at 600ºC,undergoes a temperature change at constant pressure in a cylinder with a movable piston.What final temperature of the gas can result in the change of state depicted below?

Correct AnswerverifiedShow Answer

Arrange the following gases in order of increasing rate of effusion: C2H6,Ar,HCl,and PH3.

Correct AnswerverifiedShow Answer

Which statement is false?

Correct AnswerverifiedShow Answer

The catalytic decomposition of hydrogen peroxide yields oxygen gas and water.In an experiment,decomposition of hydrogen peroxide yielded 75.3 mL of gas collected over water at 25°C and 742 torr.What mass of oxygen gas was collected? (Pwater = 24 torr at 25°C,R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedShow Answer

"The volume of an ideal gas is directly proportional to the number of moles of the gas at constant temperature and pressure" is a statement of _____________ law.

Correct AnswerverifiedShow Answer

A sample of N2 gas occupies 2.40 L at 20°C.At what temperature will the N2 gas occupy a volume of 4.80 L at constant pressure?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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What is the molar mass of an unknown gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm³ at 97°C and at a pressure of 728 mmHg? (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg) .

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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Correct Answer
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Correct Answer
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Correct Answer
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What is the volume of NH₃ produced in the following reaction when 3.0 L of N₂ reacts with 4.0 L of H₂ ? N₂(g) + 3H₂(g) → 2NH₃(g)

Correct Answer
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Correct Answer
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Determine the molar mass of Freon-11 gas if a sample weighing 0.597 g occupies 100 cm³ at 95°C and 1000 mmHg (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg) .

Correct Answer
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Correct Answer
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Arrange the following gases in order of increasing rate of effusion: C₂H₆,Ar,HCl,and PH₃.

Correct Answer
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Correct Answer
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The catalytic decomposition of hydrogen peroxide yields oxygen gas and water.In an experiment,decomposition of hydrogen peroxide yielded 75.3 mL of gas collected over water at 25°C and 742 torr.What mass of oxygen gas was collected? (P_water = 24 torr at 25°C,R = 0.08206 L • atm/K • mol)

Correct Answer
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Correct Answer
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A sample of N₂ gas occupies 2.40 L at 20°C.At what temperature will the N₂ gas occupy a volume of 4.80 L at constant pressure?

Correct Answer
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