Question 1

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

Question 2

For a substance that remains a gas under all of 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. 
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 3

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm3; the density of water is 1.00 g/cm3.

Accepted Answer

A)  348 cm 
B)  1.00 × 102 ft 
C)  18.8 mm 
D)  33.8 ft 
E)  76.0 cm 
A)  348 cm 
B)  1.00 × 102 ft 
C)  18.8 mm 
D)  33.8 ft 
E)  76.0 cm

Question 4

________ ________ is the pressure exerted by the Earth's atmosphere.

Accepted Answer

Atmospheri

Question 5

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

Accepted Answer

A)  25.2 L 
B)  30.6 L 
C)  33.6 L 
D)  37.1 L 
E)  49.2 L 
A)  25.2 L 
B)  30.6 L 
C)  33.6 L 
D)  37.1 L 
E)  49.2 L

Question 6

A gas cylinder containing 1.50 mol compressed methane has a volume of 3.30 L. What pressure does the methane exert on the walls of the cylinder if its temperature is 25°C? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  9.00 × 10-2 atm 
B)  0.933 atm 
C)  1.11 atm 
D)  1.70 atm 
E)  11.1 atm 
A)  9.00 × 10-2 atm 
B)  0.933 atm 
C)  1.11 atm 
D)  1.70 atm 
E)  11.1 atm

Question 7

Give five examples of elements that occur as gases at room temperature and pressure.

Accepted Answer

(Answers will vary.)

Question 8

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 9

A sample of nitrogen gas has the temperature drop from 250.°C to 150.°C at constant pressure. What is the final volume if the initial volume is 310. mL?

Accepted Answer

A)  0.186 L 
B)  0.251 L 
C)  0.383 L 
D)  0.410 L 
E)  0.517 L 
A)  0.186 L 
B)  0.251 L 
C)  0.383 L 
D)  0.410 L 
E)  0.517 L

Question 10

Select the gas with the largest root-mean-square molecular speed at 25°C.

Accepted Answer

A)  NH3 
B)  CO 
C)  H2 
D)  SF6 
E)  All the gases have the same root-mean-square molecular speed at 25°C. 
A)  NH3 
B)  CO 
C)  H2 
D)  SF6 
E)  All the gases have the same root-mean-square molecular speed at 25°C.

Question 11

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 12

When a closed-ended manometer is used for pressure measurements, and the closed end is under vacuum, the level of manometer liquid in the closed arm can never be lower than that in the other arm.

Accepted Answer

A) True 
 B)False

Question 13

A 1.325 g sample of an unknown vapor occupies 368 mL at 114°C and 946 mm Hg. The empirical formula of the compound is NO2. What is the molecular formula of the compound?

Accepted Answer

A)  NO2 
B)  N4O8 
C)  N3O6 
D)  N2O4 
E)  N5O10 
A)  NO2 
B)  N4O8 
C)  N3O6 
D)  N2O4 
E)  N5O10

Question 14

What volume of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO2 in excess HCl(aq)? MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g)
(R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  5.36 × 10-3 L 
B)  0.138 L 
C)  0.282 L 
D)  3.09 L 
E)  3.55 L 
A)  5.36 × 10-3 L 
B)  0.138 L 
C)  0.282 L 
D)  3.09 L 
E)  3.55 L

Question 15

Calculate the volume of H2(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s) to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  0.56 L 
B)  1.12 L 
C)  2.23 L 
D)  4.47 L 
E)  3.54 L 
A)  0.56 L 
B)  1.12 L 
C)  2.23 L 
D)  4.47 L 
E)  3.54 L

Question 16

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 17

A sample of a gas has an initial pressure of 0.987 atm and a volume of 12.8 L. What is the final pressure if the volume is increased to 25.6 L?

Accepted Answer

A)  2.03 atm 
B)  1.97 atm 
C)  0.494 atm 
D)  0.003 atm 
E)  323.4 atm 
A)  2.03 atm 
B)  1.97 atm 
C)  0.494 atm 
D)  0.003 atm 
E)  323.4 atm

Question 18

What is the temperature in Celsius at 77 K, which is the normal boiling point of liquid nitrogen?

Accepted Answer

A)  -350°C 
B)  -196°C 
C)  350°C 
D)  196°C 
E)  3.55°C 
A)  -350°C 
B)  -196°C 
C)  350°C 
D)  196°C 
E)  3.55°C

Question 19

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 20

What volume of CO2 gas at 645 torr and 800. K could be produced by the decomposition of 45.0 g of CaCO3? CaCO3(s) → CaO(s) + CO2(g)
(R = 0.08206 L • atm/K • mol)

Accepted Answer

A)  0.449 L 
B)  22.4 L 
C)  25.0 L 
D)  34.8 L 
E)  45.7 mL 
A)  0.449 L 
B)  22.4 L 
C)  25.0 L 
D)  34.8 L 
E)  45.7 mL

Exam 10: Gases

"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.

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

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm3; the density of water is 1.00 g/cm3.

________ ________ is the pressure exerted by the Earth's atmosphere.

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

A gas cylinder containing 1.50 mol compressed methane has a volume of 3.30 L. What pressure does the methane exert on the walls of the cylinder if its temperature is 25°C? (R = 0.08206 L • atm/K • mol)

Give five examples of elements that occur as gases at room temperature and 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?

A sample of nitrogen gas has the temperature drop from 250.°C to 150.°C at constant pressure. What is the final volume if the initial volume is 310. mL?

Select the gas with the largest root-mean-square molecular speed at 25°C.

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?

When a closed-ended manometer is used for pressure measurements, and the closed end is under vacuum, the level of manometer liquid in the closed arm can never be lower than that in the other arm.

A 1.325 g sample of an unknown vapor occupies 368 mL at 114°C and 946 mm Hg. The empirical formula of the compound is NO2. What is the molecular formula of the compound?

What volume of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO2 in excess HCl(aq)? MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g) (R = 0.08206 L • atm/K • mol)

Calculate the volume of H2(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s) to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

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)

A sample of a gas has an initial pressure of 0.987 atm and a volume of 12.8 L. What is the final pressure if the volume is increased to 25.6 L?

What is the temperature in Celsius at 77 K, which is the normal boiling point of liquid nitrogen?

Which represents the definition of pressure?

What volume of CO2 gas at 645 torr and 800. K could be produced by the decomposition of 45.0 g of CaCO3? CaCO3(s) → CaO(s) + CO2(g) (R = 0.08206 L • atm/K • mol)

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Bonding Theories

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm³; the density of water is 1.00 g/cm³.

is the pressure exerted by the Earth's atmosphere.

A 1.325 g sample of an unknown vapor occupies 368 mL at 114°C and 946 mm Hg. The empirical formula of the compound is NO₂. What is the molecular formula of the compound?

What volume of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO₂ in excess HCl(aq)? MnO₂(s) + 4HCl(aq) → MnCl₂(aq) + 2H₂O(l) + Cl₂(g) (R = 0.08206 L • atm/K • mol)

Calculate the volume of H₂(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s) to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

What volume of CO₂ gas at 645 torr and 800. K could be produced by the decomposition of 45.0 g of CaCO₃? CaCO₃(s) → CaO(s) + CO₂(g) (R = 0.08206 L • atm/K • mol)