Question 1

If a fixed amount of a gas is at a pressure of 2.71 atm and has a volume of 85.3 L at a temperature of 173.4 K, what is the final temperature of the gas if the pressure changes to 1.04 atm in a 105.3 L container?

Accepted Answer

A)  49.8 K
B)  75.9 K
C)  366.0 K
D)  82.1 K
E)  557.8 KF) C) and E)
G) C) and D)

Question 2

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 atmF) A) and D)
G) B) and E)

Question 3

Assuming ideal behavior, what is the density of argon gas at STP? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  0.0176 g/L
B)  0.0250 g/L
C)  0.0561 g/L
D)  1.78 g/L
E)  181 g/LF) All of the above
G) None of the above

Question 4

A gas sample occupies 8.76 L at a temperature of 37°C.What is the volume if the temperature is lowered to 0°C at constant pressure?

Accepted Answer

A)  9.95 L
B)  0 L
C)  4.22 L
D)  74.1 L
E)  7.71 LF) A) and B)
G) All of the above

Question 5

What is the volume occupied by 25.2 g of CO2 at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  0.060 L
B)  1.34 L
C)  16.7 L
D)  24.2 L
E)  734 LF) A) and B)
G) C) and D)

Question 6

A sample of nitrogen gas is confined to a 14.0-L container at 375 torr and 37.0°C.How many moles of nitrogen are in the container? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

Accepted Answer

A)  0.272 mol
B)  2.27 mol
C)  3.69 mol
D)  206 mol
E)  227 molF) C) and D)
G) A) and B)

Question 7

Which of the following is not a gas at room temperature and pressure?

Accepted Answer

A)  NH3
B)  CO2
C)  I2
D)  CH4
E)  H2F) B) and D)
G) B) and E)

Question 8

What is the density of carbon dioxide gas at −25.2°C and 98.0 kPa? (R = 0.08206 L • atm/K • mol, 1 atm = 101,325 Pa)

Accepted Answer

A)  0.232 g/L
B)  0.279 g/L
C)  0.994 g/L
D)  1.74 g/L
E)  2.09 g/LF) C) and D)
G) All of the above

Question 9

Which of the following is/are characteristic(s)  of gases?

Accepted Answer

A)  High compressibility
B)  Relatively large distances between molecules
C)  Formation of homogeneous mixtures regardless of the nature of gases
D)  Choice 1 and 2 only
E)  Choice 1, 2, and 3F) C) and D)
G) B) and E)

Question 10

Which represents the definition of pressure?

Accepted Answer

A)  volume/density
B)  temperature × area
C)  moles/volume
D)  force/area
E)  volume × forceF) All of the above
G) C) and D)

Question 11

Determine the mole fraction of N2 in a gas mixture composed of 1.0 mol of N2 and 1.5 mol of Ar.The mixture is at 0.0ºC in a 10.0-liter container.

Accepted Answer

A)  0.40
B)  0.60
C)  1.0
D)  1.5
E)  2.5F) C) and E)
G) A) and E)

Question 12

Which is not a property of a gas?

Accepted Answer

A)  The density of a gaseous substance varies strongly with temperature.
B)  A sample of gas assumes the shape and volume of its container.
C)  Gases are highly compressible.
D)  The densities of gases are much larger than those of corresponding liquids.
E)  Gases form homogeneous mixtures with one another in any proportion.F) C) and E)
G) A) and D)

Question 13

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 mLF) A) and E)
G) B) and E)

Question 14

A fixed quantity of gas has a pressure of 1.35 atm, a volume of 23.8 L, and a temperature of 205.1 K.If the pressure increases to 2.84 atm and the temperature rises to 233.4 K, what is the new volume of the gas?

Accepted Answer

A)  0.183 L
B)  7.06 L
C)  9.94 L
D)  12.9 L
E)  57.0 LF) B) and E)
G) D) and E)

Question 15

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

Accepted Answer

A)  Charles's
B)  Boyle's
C)  Dalton's
D)  Avogadro's
E)  Gay-Lussac'sF) B) and E)
G) None of the above

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°CF) A) and C)
G) A) and B)

Question 17

A 250.0-mL sample of ammonia, NH3(g) , exerts a pressure of 833 torr at 42.4°C.What mass of ammonia is in the container? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

Accepted Answer

A)  0.0787 g
B)  0.180 g
C)  8.04 g
D)  17.0 g
E)  59.8 gF) None of the above
G) C) and E)

Question 18

What are the conditions of STP?

Accepted Answer

A)  0 K and 1 atm
B)  273.15 K and 760 torr
C)  0°C and 760 atm
D)  273.15°C and 760 torr
E)  0°C and 1 torrF) A) and B)
G) A) and C)

Question 19

A sample of an ideal gas has its volume doubled while its temperature remains constant.If the original pressure was 100 torr, what is the new pressure?

Accepted Answer

A)  10 torr
B)  50 torr
C)  100 torr
D)  200 torr
E)  1000 torrF) B) and E)
G) A) and B)

Question 20

What is the density of Ar(g)  at −11°C and 675 mmHg? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg)

Accepted Answer

A)  1.52 g/L
B)  1.65 g/L
C)  −39.3 g/L
D)  40.0 g/L
E)  1.25 kg/LF) B) and C)
G) A) and C)

Exam 8: Gases

What is the volume occupied by 25.2 g of CO2 at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)

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A gas sample occupies 8.76 L at a temperature of 37°C.What is the volume if the temperature is lowered to 0°C at constant pressure?

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A 250.0-mL sample of ammonia, NH3(g) , exerts a pressure of 833 torr at 42.4°C.What mass of ammonia is in the container? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

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Which of the following is not a gas at room temperature and pressure?

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What is the density of Ar(g) at −11°C and 675 mmHg? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg)

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If a fixed amount of a gas is at a pressure of 2.71 atm and has a volume of 85.3 L at a temperature of 173.4 K, what is the final temperature of the gas if the pressure changes to 1.04 atm in a 105.3 L container?

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A sample of an ideal gas has its volume doubled while its temperature remains constant.If the original pressure was 100 torr, what is the new pressure?

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Which is not a property of a gas?

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Which of the following is/are characteristic(s) of gases?

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Assuming ideal behavior, what is the density of argon gas at STP? (R = 0.08206 L • atm/K • mol)

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What are the conditions of STP?

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A fixed quantity of gas has a pressure of 1.35 atm, a volume of 23.8 L, and a temperature of 205.1 K.If the pressure increases to 2.84 atm and the temperature rises to 233.4 K, what is the new volume of the gas?

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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?

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Determine the mole fraction of N2 in a gas mixture composed of 1.0 mol of N2 and 1.5 mol of Ar.The mixture is at 0.0ºC in a 10.0-liter container.

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Which represents the definition of pressure?

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

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A sample of nitrogen gas is confined to a 14.0-L container at 375 torr and 37.0°C.How many moles of nitrogen are in the container? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

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What is the density of carbon dioxide gas at −25.2°C and 98.0 kPa? (R = 0.08206 L • atm/K • mol, 1 atm = 101,325 Pa)

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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?

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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?

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What is the volume occupied by 25.2 g of CO₂ at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)

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A 250.0-mL sample of ammonia, NH₃(g) , exerts a pressure of 833 torr at 42.4°C.What mass of ammonia is in the container? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

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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?

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Determine the mole fraction of N₂ in a gas mixture composed of 1.0 mol of N₂ and 1.5 mol of Ar.The mixture is at 0.0ºC in a 10.0-liter container.

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