1. © 2012 Pearson Education, Inc. Gases

2. © 2012 Pearson Education, Inc. a.The volume occupied by a gas is mostly empty space. b.The average kinetic energy of the gas particles is proportional to the temperature in Celsius. c.The attraction/repulsion between gas molecules is very weak or negligible. d.Gas molecules or atoms move in a straight line between collisions. e.All of the above are correct postulates. 11.1 All of the following are postulates of the kinetic molecular theory of gases EXCEPT:

3. © 2012 Pearson Education, Inc. a.0.76 atm b.1.00 atm c.5.80 atm d.0.763 atm e.4.41  10 5 atm 11.2 Convert 580 mm Hg to units of atmospheres.

4. © 2012 Pearson Education, Inc. a.2.41 kPa b.2.45  10 2 kPa c.5.29  10 2 kPa d.2.45  10 5 kPa e.5.29  10 5 kPa 11.3 Convert 35.5 psi to kPa. (Note: 1 atm = 14.7 psi; 1 atm = 101325 Pa)

5. © 2012 Pearson Education, Inc. a.  1 b.  2 c.  4 d.  1/2 e.  1/4 11.4 A gas has a volume of 1.0 L at 1 atm. By what factor must the pressure change in order to reduce the volume by half? ( Assume the temperature is constant.)

6. © 2012 Pearson Education, Inc. a.651 mL b.1.65  10 3 mL c.0.151 mL d.151 mL e.500. mL 11.5 A flask with 500.0 mL of a gas is sealed on top of Mt. Everest where the atmospheric pressure is 230. torr. What is the volume of the gas when the bottle is moved to sea level at a constant temperature?

7. © 2012 Pearson Education, Inc. a.0.375 L b.0.959 L c.1.20 L d.0.833 L e.1.88 L 11.7 A flexible container contains 1.50 L of gas at 25 °C. What is the new volume when the container is heated to 100 °C at a constant pressure?

8. © 2012 Pearson Education, Inc. a.0.740 g b.11.8 g c.0.740 mol d.23.7 g e.None of the above 11.8 A 36.1 mL sample of oxygen gas contains 0.529 mol of oxygen. If enough oxygen is added to the sample to obtain a volume of 50.5 mL, what must the final mass of the sample be? (The pressure and temperature is constant.)

9. © 2012 Pearson Education, Inc. a.1.00 mol b.2.00 mol c.3.00 mol d.5.00 mol e.10.0 mol 11.10 A container with 1.00 mol of gas is expanded from 5.00 L to 10.0 L by adding more gas. How many moles of gas are present? (The temperature and pressure are kept constant.)

10. © 2012 Pearson Education, Inc. a.37.8 psi b.35.0 psi c.0 psi d.40.1 psi e.29.9 psi 11.11 A set of car tires contain a volume of 45.5 L of air at 35.0 psi and 0.0 °C. When the car is driven, the temperature of the tires increases to 40.0 °C. What is the pressure (in psi) of each tire assuming constant volume?

11. © 2012 Pearson Education, Inc. a.1.3 mol b.0.229 mol c.0.174 mol d.2.58 mol e.0.17 mol 11.12 How many moles of an ideal gas are in a container with a volume of 5.5 L at 580 mm Hg and 20.°C?

12. © 2012 Pearson Education, Inc. a.0.0295 L b.1.00 L c.22.4 L d.48.8 L e.0.0446 L 11.13 What is the volume occupied by 28.0 g of nitrogen gas at 1.00 atm and 0.0 °C?

13. © 2012 Pearson Education, Inc. a.5.00%, 70.3%, 24.7% b.6.67%, 66.0%, 27.3% c.0.500%, 49.5%, 50.0% d.10.0%, 50.0%, 40.0% e.1.50%, 75.5%, 23.0% 11.17 The partial pressures in a mixture of CO 2, N 2, and O 2 in a sample of gas are 50.0 atm, 495 atm, and 205 atm, respectively. Calculate the mole percentage of each gas.

14. © 2012 Pearson Education, Inc. a.9 mm Hg b.69 mm Hg c.626 mm Hg d.635 mm Hg e.644 mm Hg 11.18 A sample of hydrogen gas is collected over water at a pressure of 635 mm Hg at 10.0 °C. Calculate the partial pressure of hydrogen. (The vapor pressure of water at 10.0 °C is 9.2 mm Hg)

15. © 2012 Pearson Education, Inc. a.0.225 L b.36.3 L c.201 L d.403 L e.0.0239 L 11.19 How many liters of oxygen gas are produced by the complete decomposition of 225 mL of water? The oxygen gas is collected at 580. torr and 27°C. (The density of water at 27°C is 1.00 g/mL)

16. © 2012 Pearson Education, Inc. a.0.705 g b.2.82 g c.12.7 g d.38.1 g e.50.8 g 11.20 How many grams of water are produced from the complete combustion of 15.8 L of propane (C 3 H 8 ) gas at STP?

17. © 2012 Pearson Education, Inc. a.1.00 mol O 2 b.48.0 g O 2 c.0.500 mol He d.4.008 g H 2 e.6.02 x 10 23 molecules of N 2 11.21 Which of the following samples occupy the largest volume at STP?

18. © 2012 Pearson Education, Inc. a.Pa b.atm c.mm Hg d.torr e.psi 11.25 What is the SI unit for pressure?

19. © 2012 Pearson Education, Inc. a.369 °C b.25.0 °C c.96.8 °C d.2.47 °C e.9.68 °C 11.26 A 158-mL sample of gas has a pressure of 0.989 atm and a temperature of 25.0 °C. What is the final temperature (°C) when the pressure increases to 1.01 atm and the volume decreases to 192 mL?

20. © 2012 Pearson Education, Inc. a.1.38 atm b.8.85 atm c.5.68 atm d.0.989 atm e.1.27 atm 11.27 If a 7.45 L sample of nitrogen at STP is compressed to a volume of 5.81 L and warmed to 295 K, what is the final pressure of the sample?

21. © 2012 Pearson Education, Inc. a.22.4 L b.45 L c.720 mL d.130 mL e.20. L 11.29 Water decomposes to form hydrogen and oxygen gases. What volume of oxygen gas measured at 750 mm Hg and 35°C is formed when 28 g of water is reacted?

22. © 2012 Pearson Education, Inc. a.0.1115 g b.7.9 g c.1.295 g d.7.904 g e.3.953 g 11.30 What is the mass of a sample of chlorine gas that occupies a volume of 2.500 L at STP?