4-1 ©2013 McGraw-Hill Ryerson Limited 4-1
Question 1 Which of the following cannot be explained by considering the empty space between the particles of a gas? A) Gases are more compressible than liquids. B) Gases have lower viscosities than liquids. C) After thorough stirring, all gas mixtures are
solutions. D) The density of a substance in the gas state
is lower than in the liquid state. E) All of these can be explained by
considering the empty space between the particles of a gas.
4-2 ©2013 McGraw-Hill Ryerson Limited 4-2
Question 2 A long glass tube, sealed at one end, has an inner diameter of 10.0 mm. The tube is filled with water and inverted into a pail of water. If the atmospheric pressure is 755 mm Hg, how high (in mm H2O) is the column of water in the tube? dHg = 13.5 g/mL; dwater = 1.00 g/mL A) 1.02 x 104
B) 55.93 C) 9.44 x 102
D) 755 E) 1.79 x 10-2
4-3 ©2013 McGraw-Hill Ryerson Limited 4-3
Question 3 During an experiment it was observed that the volume of the gas involved increased. Which of the following would be a possible explanation of how this could have happened? A) decrease sample mass keeping temperature and
pressure constant B) increase the pressure keeping mass and
temperature constant C) increase temperature keeping mass and pressure
constant D) decrease sample size, increase pressure keeping
mass constant E) decrease temperature and sample mass keeping
pressure constant.
4-4 ©2013 McGraw-Hill Ryerson Limited 4-4
Question 4 A sample of sulfur hexafluoride gas occupies a volume of 5.10 L at 198 ºC. Assuming that the pressure and amount of gas remain constant, what temperature (in ºC) is needed to reduce the volume to 2.50 L? A) -176 B) 688 C) 231 D) -42 E) 97
4-5 ©2013 McGraw-Hill Ryerson Limited 4-5
Question 5
A sample of chlorine gas is confined in a 5.0 L container at 0.304 bar and 27ºC. What amount of gas (mol) is present in the sample? A) 514 mol B) 0.061 mol C) 0.677 mol D) 0.0050 mol E) 42.2 mol
4-6 ©2013 McGraw-Hill Ryerson Limited 4-6
Question 6
What is the density of Freon-11 (CFCl3) at 120ºC and 1.5 bar? A) 6.3 g/L B) 21 g/L C) 0.63 g/L D) 0.047 g/L E) Cannot determine with the information
provided.
4-7 ©2013 McGraw-Hill Ryerson Limited 4-7
Question 7 A sample of liquid hydrocarbon known to consist of molecules with five carbon atoms is vaporized in a 0.204 L flask by immersion in a water bath at 101ºC and a barometric pressure of 1.02 bar; subsequently, the gas is condensed to 0.482 g of liquid. What is the molecular formula of the hydrocarbon? A) C5H5 B) C5H7 C) C5H9 D) C5H12 E) C5H14
4-8 ©2013 McGraw-Hill Ryerson Limited 4-8
Question 8
What mass of potassium chlorate decomposes to potassium chloride and 638 mL of O2 at 128ºC and 1.00 bar?
2KClO3 → 2KCl + 3O2 A) 0.0192 g B) 0.0128 g C) 2.35 g D) 3.53 g E) 1.56 g
4-9 ©2013 McGraw-Hill Ryerson Limited 4-9
Question 9
What is the effusion rate for O2 compared to Kr? A) 1.618 B) 0.618 C) 2.619 D) 0.318 E) 7.197
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Question 10
What will happen to the volume of a gas if its pressure is decreased from 2 bar to 1 bar, while its temperature is decreased from 200ºC to 100ºC? A) increase B) decrease C) remain same
4-11 ©2013 McGraw-Hill Ryerson Limited 4-11
Question 11
If the atmospheric pressure is 690.4 mmHg and the difference in height in the diagram to the right is 5.4 cm, what is the pressure of the gas in the flask? A) 636.4 mmHg B) 685.0 mmHg C) 695.8 mmHg D) 744.4 mmHg
4-12 ©2013 McGraw-Hill Ryerson Limited 4-12
Question 12
For a fixed amount of gas at constant pressure, what will happen to the volume of a gas if the temperature is decreased? A) The volume will decrease. B) The volume will increase. C) The volume will remain unchanged. D) There is insufficient information to
determine.
4-13 ©2013 McGraw-Hill Ryerson Limited 4-13
Question 13
Hydrogen gas exerts a pressure of 466 mm Hg in a container. What is this pressure in bar? A) 0.605 bar B) 0.613 bar C) 0.621 bar D) 1.63 bar E) 1.65 bar
4-14 ©2013 McGraw-Hill Ryerson Limited 4-14
Question 14
A sample of an ideal gas has its volume doubled while its temperature remains constant. If the original pressure was 100 bar, what is the new pressure? A) 10 bar B) 50 bar C) 100 bar D) 200 bar E) 1000 bar
4-15 ©2013 McGraw-Hill Ryerson Limited 4-15
Question 15
Arrange the following gases in order of increasing rate of effusion. C2H6, Ar, HCl, PH3
A) Ar < HCl < PH3 < C2H6 B) C2H6 < PH3 < HCl < Ar C) Ar < PH3 < C2H6 < HCl D) C2H6 < HCl < PH3 < Ar E) Ar < PH3 < HCl < C2H6
4-16 ©2013 McGraw-Hill Ryerson Limited 4-16
Question 16
Nitrogen will behave most like an ideal gas A) at high temperature and high pressure. B) at high temperature and low pressure. C) at low temperature and high pressure. D) at low temperature and low pressure. E) at intermediate (moderate) temperature
and pressure.
4-17 ©2013 McGraw-Hill Ryerson Limited 4-17
Question 17
At constant temperature and amount (mol), how is the pressure of a gas affected when the volume of the gas is increased? A) The pressure will increase. B) The pressure will decrease. C) The pressure will remain the same. D) There is insufficient information to
determine.
4-18 ©2013 McGraw-Hill Ryerson Limited 4-18
Question 18
If you fill a balloon with 2.50 moles of gas at 28 °C and a pressure of 1.20 bar, what is the volume of the balloon? A) 4.79 L B) 22.4 L C) 52.1 L D) 56.0 L
4-19 ©2013 McGraw-Hill Ryerson Limited 4-19
Question 19
What is the molar mass of a gas which has a density of 6.65 g/L at 25 °C and 1.00 bar? A) 81.7 g/mol B) 149 g/mol C) 165 g/mol D) 496 g/mol
4-20 ©2013 McGraw-Hill Ryerson Limited 4-20
Question 20
A mixture of N2 and O2 has a total pressure of 0.95 bar. What is the partial pressure (in bar) of N2 if there are 0.56 mol N2 and 0.32 mol O2 in the mixture? A) 0.30 bar B) 0.35 bar C) 0.53 bar D) 0.60 bar
4-21 ©2013 McGraw-Hill Ryerson Limited ©2013 McGraw-Hill Ryerson Limited
Answer Key – Chapter 4 1. E 2. A 3. C 4. D 5. B 6. A 7. D 8. E 9. A 10. A
11. D 12. A 13. C 14. B 15. A 16. B 17. B 18. C 19. C 20. D
