Library Guides: Chemistry Textbook: Self-Assessments

1. Matter and MeasurementsToggle Dropdown
2. Atoms, Molecules and IonsToggle Dropdown
3. Composition of Substances and SolutionsToggle Dropdown
4. Stoichiometry of Chemical ReactionsToggle Dropdown
5. ThermochemistryToggle Dropdown
6. Gases
7. Chemical Bonding and Molecular GeometryToggle Dropdown
8. Liquids, Solids, and Modern MaterialsToggle Dropdown
9. Solutions and Colligative PropertiesToggle Dropdown
10. KineticsToggle Dropdown
11. Chemical Equilibria and ApplicationsToggle Dropdown
12. ThermodynamicsToggle Dropdown
13. ElectrochemistryToggle Dropdown
14. AppendicesToggle Dropdown

Self-Assessments

Gas Laws- I
Gas Laws- II
Gas properties- density, stoichiometry
Partial Pressures
Diffusion and Effusion

For an ideal gas, which of the following relationships is NOT true?

Choose 1 answer

P ∝ V

V ∝ 1/n

P ∝ T

Both A and B

Both B and C

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This is feedback for Option-E

A gas bubble under water at a pressure of 2.5 atm has a volume of 0.5 mL. What is the pressure of the bubble when it rises to the surface of water where the pressure is 1 atm?

Choose 1 answer

5 mL

3.5 mL

1.25 mL

0.75 mL

0.2 mL

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This is feedback for Option-B

This is feedback for Option-C

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This is feedback for Option-E

A gas in a balloon at 1 atm pressure occupies a volume of 1.7 L at 25^o
At what temperature is the gas if the same balloon at the same pressure occupies 1.9 L volume.

Choose 1 answer

60^oC

32^oC

28^oC

22^oC

-6.4^oC

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

Air pressure inside an inflated tire is 32 psi at 21.7 ^oC (71 ^oF). What is the pressure when the temperature drops to 1.0 ^oC (34 ^oF)?

Choose 1 answer

29.8 psi

28.1 psi

25.2 psi

14.7 psi

15.3 psi

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This is feedback for Option-B

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This is feedback for Option-D

This is feedback for Option-E

Zinc is reacted with hydrochloric acid in an evacuated container fitted with a pressure gauge. The reaction produced hydrogen gas. When 4.11 grams of hydrogen is produced, the pressure gauge reads 2.30 atm. What will the pressure gauge read when one more gram of hydrogen is produced? Assume that the temperature does not change.

Choose 1 answer

9.13 atm

3.10 atm

2.86 atm

1.85 atm

0.56 atm

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This is feedback for Option-B

This is feedback for Option-C

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This is feedback for Option-E

2.00L of a gas at 35^oC and 633 mm Hg is brought to standard temperature and pressure (STP). What will be the new gas volume?

Choose 1 answer

1122 L

11.4

1.77 L

1.61 L

1.48 L

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

Modern refrigerators take advantage of gas laws to remove heat from a system. A compressed refrigerant gas occupies a volume of 3.0 L at 25^oC and is at 5 atm pressure. What is the temperature of the gas when it has expanded to a 6.0 L volume it’s pressure has dropped to 2 atm pressure?

Choose 1 answer

-40 ^oC

-34 ^oC

-23 ^oC

7.2 ^oC

20 ^oC

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

5.0 g of carbon dioxide is at 256 mm Hg and at a temperature of 35^oC. What is its volume?

Choose 1 answer

89 L

8.5 L

43 L

0.99 L

0.0013 L

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

1 mole of which of the following gases occupies the largest volume at STP?

Choose 1 answer

H₂

F₂

CO₂

SF₆

All occupy the same volume.

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This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

Freon (CF₂Cl₂) is used as a refrigerant in air-conditioners. What is the volume of 5.5 grams of freon at STP?

Choose 1 answer

0.42 L

0.51 L

120 L

30.0 L

1.0 L

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This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

A certain reaction occurs, producing an oxide of nitrogen as a gas. The gas has a mass of 1.21g and occupies a volume of 677mL. The temperature in the laboratory is 23^oC and the air pressure is 0.987atm. Identify the gas. (Assume that the gas is ideal).

Choose 1 answer

NO₂

N₂O

N₂O₄

N₂O₅

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

What is the density of Neon gas at 25^oC and 1.5 atm pressure?

Choose 1 answer

1.23 g/mL

1.23 g/L

2.47 g/mL

2.47 g/L

14.7 g/L

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This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

What is the molar mass of a gas that has a density of 6.17 g/L at STP?

Choose 1 answer

138 g/mol

146 g/mo

151 g/mol

162 g/mol

Not enough information to determine the answer

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

What is the pressure of 0.10 M hydrogen gas at 25^oC?

Choose 1 answer

4.9 atm

3.7 atm

3.2 atm

2.4 atm

0.21 atm

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

How many grams of H₂O will be produced by 58.2 L of CH₄ at STP in the following reaction?
CH₄(g) + 2 O₂(g) → CO₂(g) + 2H₂O(l)

Choose 1 answer

105 g

93.6 g

83.1 g

46.8 g

32.1 g

This is feedback for Option-A

Solve for moles of CH₄ at STP. Then use the mole ratio from the balanced equation to convert to moles of H₂O followed by converting to grams.

This is feedback for Option-C

Looks like you did not use the stoichiometric ratio. According to the balanced equation, 1 mole of CH₄ produces 2 moles of H₂O.

This is feedback for Option-E

A mixture of hydrogen gas and water vapor is at STP. What is the partial pressure of the hydrogen gas in the mixture if the partial pressure of the water vapor is 4.58 mmHg?

Choose 1 answer

3.58 mm Hg

652 mm Hg

770 mm Hg

755 mm Hg

765 mm Hg

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

A gas mixture at 2.5 atm pressure contains 1.2g Argon (Ar) and 3.6g Neon (Ne). What is the partial pressure of Neon in the mixture?

Choose 1 answer

2.1 atm

1.88 atm

0.86 atm

0.35 atm

0.14 atm

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

A mixture of H₂, O₂ and N₂ gases is at a pressure of 4.0 atm. The partial pressures of H₂ and N₂ are 1.3 atm and 1.6 atm, respectively. What is the mole-fraction of O₂ in the mixture?

Choose 1 answer

3.6

1.1

0.40

0.28

0.33

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This is feedback for Option-C

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This is feedback for Option-E

A cylinder of compressed natural gas has a volume of 20.0 L and contains 1013 g of methane (CH₄) and 336 g of ethane (C₂H₆). Calculate the partial pressure of methane in the mixture at 25^o

Choose 1 answer

3.69 atm

6.47 atm

77.2 atm

137 atm

273 atm

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

Deep-sea divers must use special gas mixtures in their tanks, rather than compressed air, to avoid serious problems, most notably a condition called “the bends.”

A typical gas cylinder used for deep-sea diving contains 51.2 g of O₂and 226.4 g of He and has a volume of 10.0 L. What is the total pressure in the cylinder at 20.00°C?

Choose 1 answer

3.85 atm

105 atm

122 atm

136 atm

140 atm

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

Gas molecules will diffuse faster if the

Choose 1 answer

temperature decreases

temperature increases

pressure decreases

volume increases

molecular weight increases

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

Which of the following gases has the highest rate of effusion?

Choose 1 answer

I₂(g)

O₂(g)

Xe(g)

Ne(g)

He(g)

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

Naturally occurring uranium has only 0.72% of ²³⁵U isotope which is fissile (capable of breaking apart to release nuclear energy), and the rest is the non-fissile ²³⁸U isotope. At least a thousand effusion steps are used to reach a 99% enrichment.

Calculate the ratio of the rates of effusion of ²³⁵UF₆and ²³⁸UF₆ for a single step in which UF₆ is allowed to pass through a porous barrier.

Choose 1 answer

1.0086

1.0043

1.0021

0.9957

0.9915

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This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

A diatomic gas, X₂, effuses 0.447 times the rate at which O₂ gas effuses. Identify the gas.

Choose 1 answer

N₂

H₂

F₂

Cl₂

Br₂

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

How fast does H₂ effuse compared to Cl₂ gas?

Choose 1 answer

2 times faster

4 times faster

6 times faster

9 times faster

35 times faster

This is feedback for Option-A

This is feedback for Option-B

This is feedback for Option-C

This is feedback for Option-D

This is feedback for Option-E

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Chemistry Textbook

Self-Assessments

For an ideal gas, which of the following relationships is NOT true?

A gas bubble under water at a pressure of 2.5 atm has a volume of 0.5 mL. What is the pressure of the bubble when it rises to the surface of water where the pressure is 1 atm?

A gas in a balloon at 1 atm pressure occupies a volume of 1.7 L at 25o At what temperature is the gas if the same balloon at the same pressure occupies 1.9 L volume.

Air pressure inside an inflated tire is 32 psi at 21.7 oC (71 oF). What is the pressure when the temperature drops to 1.0 oC (34 oF)?

2.00L of a gas at 35oC and 633 mm Hg is brought to standard temperature and pressure (STP). What will be the new gas volume?

Modern refrigerators take advantage of gas laws to remove heat from a system. A compressed refrigerant gas occupies a volume of 3.0 L at 25oC and is at 5 atm pressure. What is the temperature of the gas when it has expanded to a 6.0 L volume it’s pressure has dropped to 2 atm pressure?

5.0 g of carbon dioxide is at 256 mm Hg and at a temperature of 35oC. What is its volume?

1 mole of which of the following gases occupies the largest volume at STP?

Freon (CF2Cl2) is used as a refrigerant in air-conditioners. What is the volume of 5.5 grams of freon at STP?

A certain reaction occurs, producing an oxide of nitrogen as a gas. The gas has a mass of 1.21g and occupies a volume of 677mL. The temperature in the laboratory is 23oC and the air pressure is 0.987atm. Identify the gas. (Assume that the gas is ideal).

What is the density of Neon gas at 25oC and 1.5 atm pressure?

What is the molar mass of a gas that has a density of 6.17 g/L at STP?

What is the pressure of 0.10 M hydrogen gas at 25oC?

How many grams of H2O will be produced by 58.2 L of CH4 at STP in the following reaction?CH4(g) + 2 O2(g) → CO2(g) + 2H2O(l)

A mixture of hydrogen gas and water vapor is at STP. What is the partial pressure of the hydrogen gas in the mixture if the partial pressure of the water vapor is 4.58 mmHg?

A gas mixture at 2.5 atm pressure contains 1.2g Argon (Ar) and 3.6g Neon (Ne). What is the partial pressure of Neon in the mixture?

A mixture of H2, O2 and N2 gases is at a pressure of 4.0 atm. The partial pressures of H2 and N2 are 1.3 atm and 1.6 atm, respectively. What is the mole-fraction of O2 in the mixture?

A cylinder of compressed natural gas has a volume of 20.0 L and contains 1013 g of methane (CH4) and 336 g of ethane (C2H6). Calculate the partial pressure of methane in the mixture at 25o

Gas molecules will diffuse faster if the

Which of the following gases has the highest rate of effusion?

A diatomic gas, X2, effuses 0.447 times the rate at which O2 gas effuses. Identify the gas.

How fast does H2 effuse compared to Cl2 gas?

A gas in a balloon at 1 atm pressure occupies a volume of 1.7 L at 25^o
At what temperature is the gas if the same balloon at the same pressure occupies 1.9 L volume.

Air pressure inside an inflated tire is 32 psi at 21.7 ^oC (71 ^oF). What is the pressure when the temperature drops to 1.0 ^oC (34 ^oF)?

2.00L of a gas at 35^oC and 633 mm Hg is brought to standard temperature and pressure (STP). What will be the new gas volume?

Modern refrigerators take advantage of gas laws to remove heat from a system. A compressed refrigerant gas occupies a volume of 3.0 L at 25^oC and is at 5 atm pressure. What is the temperature of the gas when it has expanded to a 6.0 L volume it’s pressure has dropped to 2 atm pressure?

5.0 g of carbon dioxide is at 256 mm Hg and at a temperature of 35^oC. What is its volume?

Freon (CF₂Cl₂) is used as a refrigerant in air-conditioners. What is the volume of 5.5 grams of freon at STP?

A certain reaction occurs, producing an oxide of nitrogen as a gas. The gas has a mass of 1.21g and occupies a volume of 677mL. The temperature in the laboratory is 23^oC and the air pressure is 0.987atm. Identify the gas. (Assume that the gas is ideal).

What is the density of Neon gas at 25^oC and 1.5 atm pressure?

What is the pressure of 0.10 M hydrogen gas at 25^oC?

How many grams of H₂O will be produced by 58.2 L of CH₄ at STP in the following reaction?
CH₄(g) + 2 O₂(g) → CO₂(g) + 2H₂O(l)

A mixture of H₂, O₂ and N₂ gases is at a pressure of 4.0 atm. The partial pressures of H₂ and N₂ are 1.3 atm and 1.6 atm, respectively. What is the mole-fraction of O₂ in the mixture?

A cylinder of compressed natural gas has a volume of 20.0 L and contains 1013 g of methane (CH₄) and 336 g of ethane (C₂H₆). Calculate the partial pressure of methane in the mixture at 25^o

A diatomic gas, X₂, effuses 0.447 times the rate at which O₂ gas effuses. Identify the gas.

How fast does H₂ effuse compared to Cl₂ gas?