Question 1

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

Question 2

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

Question 3

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 g 
A) 0.0787 g 
B) 0.180 g 
C) 8.04 g 
D) 17.0 g 
E) 59.8 g

Question 4

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

Question 5

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 L 
A) 9.95 L 
B) 0 L 
C) 4.22 L 
D) 74.1 L 
E) 7.71 L

Question 6

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) 2.5 
A) 0.40 
B) 0.60 
C) 1.0 
D) 1.5 
E) 2.5

Question 7

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 3 
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 3

Question 8

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

Question 9

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

Question 10

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

Question 11

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

Question 12

Which represents the definition of pressure?

Accepted Answer

A) volume/density 
B) temperature × area 
C) moles/volume 
D) force/area 
E) volume × force 
A) volume/density 
B) temperature × area 
C) moles/volume 
D) force/area 
E) volume × force

Question 13

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/L 
A) 0.232 g/L 
B) 0.279 g/L 
C) 0.994 g/L 
D) 1.74 g/L 
E) 2.09 g/L

Question 14

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 torr 
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 torr

Question 15

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

Question 16

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/L 
A) 0.0176 g/L 
B) 0.0250 g/L 
C) 0.0561 g/L 
D) 1.78 g/L 
E) 181 g/L

Question 17

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. 
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.

Question 18

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

Question 19

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

Question 20

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

Accepted Answer

A) NH3 
B) CO2 
C) I2 
D) CH4 
E) H2 
A) NH3 
B) CO2 
C) I2 
D) CH4 
E) H2

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?

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

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)

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?

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?

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.

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

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)

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?

"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.

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)

Which represents the definition of pressure?

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)

What are the conditions of STP?

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?

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

Which is not a property of a gas?

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?

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?

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

Atoms and Elements

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

The Mole and Chemical Formulas

Molecular Shape

Solids, Liquids, and Phase Changes

Physical Properties of Solutions

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Using Balanced Chemical Equations

Acids and Bases

Equilibrium

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Exam 8: Gases

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?

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

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)

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?

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?

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.

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

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)

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?

"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.

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)

Which represents the definition of pressure?

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)

What are the conditions of STP?

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?

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

Which is not a property of a gas?

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?

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?

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

Atoms and Elements

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

The Mole and Chemical Formulas

Molecular Shape

Solids, Liquids, and Phase Changes

Physical Properties of Solutions

Chemical Reactions and Chemical Equations

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

Biochemistry

Nuclear Chemistry

Electrochemistry

Filters

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)

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.

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)

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?