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05_CTR_ch14 7/12/04 8:13 AM Page 351

Name ___________________________

14.3

Date ___________________

Class __________________

IDEAL GASES

Section Review
Objectives
• Compute the value of an unknown using the ideal gas law
• Compare and contrast real and ideal gases

Vocabulary
• ideal gas constant (R)
• ideal gas law

Key Equation
• Ideal gas law: P

V

n

R

T or PV

nRT

Part A Completion

© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.

Use this completion exercise to check your understanding of the concepts and terms that are introduced in this section. Each blank can be completed with a term, short phrase, or number.
1

The ideal gas law permits you to solve for the

of a

1.

contained gas when the pressure, volume, and temperature are

2.

known. The ideal gas law is described by the formula
3

where the variable

2

3.

represents the number of moles of

gas and the letter R is the

4

. R is equal to

5

.

5.

A gas that conforms to the gas laws at all conditions of
temperature and pressure is an

6

7

6.

gas

7.

behaves ideally at all temperatures and pressures. Deviations

8.

from ideal behavior at high pressures can be explained by the

9.

intermolecular
9

8

gas. No

4.

between particles in a gas and the actual

of the particles.

Chapter 14 The Behavior of Gases

351

05_CTR_ch14 7/12/04 8:13 AM Page 352

Name ___________________________

Date ___________________

Class __________________

Part B True-False
Classify each of these statements as always true, AT; sometimes true, ST; or never true, NT. ________ 10. The ideal gas law allows you to solve for the number of moles of a contained gas when pressure, volume, and temperature are known. ________ 11. The ratio (P

V)/(R

T ) is equal to 1 for real gases.

________ 12. The behavior of a gas is most likely to approach ideal behavior at a high pressure and a low temperature.
________ 13. For an ideal gas, pressure and volume are directly proportional to each other when all other factors remain constant.
________ 14. The number of moles of gas is directly proportional to the number of particles.

Part C Matching
Match each description in Column B to the correct term in Column A.

Column A

Column B
LpkPa
Kpmol

a. 8.31

________ 16. real gas

b. a gas that follows the gas laws at all conditions of
pressure and temperature

________ 17. ideal gas

c. a gas that can be liquefied by applying pressure

________ 18. ideal gas constant (R)

d. PV

nRT

Part D Questions and Problems
Answer the following in the space provided.
19. Calculate the number of moles of oxygen in a 12.5-L tank if the pressure is 25,325 kPa and the temperature is 22 C.

20. Calculate the mass of nitrogen dioxide present in a 275-mL container if the pressure is 240.0 kPa and the temperature is 28 C.

352

Core Teaching Resources

© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.

________ 15. ideal gas law

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