1. A gas sample is held at constant pressure. The gas occupies 3.62 L of volume when the temperature is 21.6°C. Determine the temperature at which the volume of the gas is 
3.45 L.
[A] 20.6 K
[B] 281 K
[C] 326 K
[D] 294 K
[E] 309 K

2. Body temperature is about 308 K. On a cold day, what volume of air at 273 K must a person with a lung capacity of 2.00 L breathe in to fill the lungs?
[A] 1.77 L
[B] 1.13 L
[C] 3.54 L
[D] 2.26 L
[E] none of these

3. When 0.72 g of a liquid is vaporized at 110°C and 0.967 atm, the gas occupies a volume of 0.559 L. The empirical formula of the gas is CH2. What is the molecular formula of the gas?
[A] C4H8
[B] C3H6
[C] C2H4
[D] CH2
[E] none of these

4. A sample of helium gas occupies 12.4 L at 23°C and 0.956 atm.  What volume will it occupy at 40°C and 1.20 atm?
[A] 17.2 L
[B] 0.488 L
[C] 10.4 L
[D] 6.28 L
[E] 12.4 L

5. Zinc metal is added to hydrochloric acid to generate hydrogen gas and is collected over a liquid whose vapor pressure is the same as pure water at 20.0°C (18 torr). The volume of the mixture is 1.7 L and its total pressure is 0.810 atm.
 Determine the partial pressure of the hydrogen gas in this mixture.
[A] 580 torr
[B] 616 torr
[C] 634 torr
[D] 562 torr
[E] 598 torr

6. Consider three 1-L flasks at STP. Flask A contains NH3 gas, flask B contains NO2 gas, and flask C contains N2 gas.
 In which flask are the molecules least polar and therefore most ideal in behavior?
[A] flask A
[B] flask C
[C] flask B
[D] all are the same
[E] none

7. The purity of a sample containing zinc and weighing 0.198 g is determined by measuring the amount of hydrogen formed when the sample reacts with an excess of hydrochloric acid. The determination shows the sample to be 84.0% zinc. What amount of hydrogen (measured at STP) was obtained?
[A] 1.53 ´ 1021 molecules
[B] 1.53 ´ 1021 atoms
[C] 0.152 L
[D] 3.42 ´ 10-3 mole
[E] 0.0330 g

8. What volume does 28.0 g of N2 occupy at STP?
[A] 5.60 L
[B] 11.2 L
[C] 22.4 L
[D] 44.8 L
[E] none of these

9. A 4.40-g piece of solid CO2 (dry ice) is allowed to sublime in a balloon. The final volume of the balloon is 1.00 L at 300 K. What is the pressure of the gas?
[A] 122 atm
[B] 0.122 atm
[C] 246 atm
[D] 2.46 atm
[E] none of these

10. A gaseous mixture containing 1.5 mol Ar and 3.5 mol CO2 has a total pressure of 7.0 atm. What is the partial pressure of CO2?
[A] 1.8 atm
[B] 4.9 atm
 [C] 2.1 atm
[D] 3.5 atm
[E] 2.4 atm

11. Which of the following would have a higher rate of effusion than C2H2?
[A] CO2
[B] N2
[C] CH4
[D] O2
[E] Cl2

12. A sample of oxygen gas has a volume of 4.50 L at 27°C and 800.0 torr. How many oxygen molecules does it contain?
[A] 1.16 ´ 1022
[B] 1.16 ´ 1023
[C] 5.8 ´ 1022
[D] 2.32 ´ 1024
[E] none of these

13. Calculate the density of F2 gas at 26°C and 755 torr.

14. Gaseous C2H4 reacts with O2 according to the following equation:
	C2H4(g) + 3O2(g) ® 2CO2(g) + 2H2O(g)
What volume of oxygen at STP is needed to react with 1.50 mol of C2H4?

[A] 67.2 L
[B] 33.6 L
[C] Not enough information is given to solve the problem.
[D] 4.50 L
[E] 101 L

15. At the same temperature lighter molecules have a higher average kinetic energy than heavier molecules.

[A] True
[B] False

16. You and a friend have gas samples in open manometers as shown:

You have Hg(l) in your manometer and your friend has water. The height h is the same in both manometers. Which of the following statements is true?

[A] Both samples of gas have the same pressure.
[B] There is not enough information to answer the question.
[C] Your sample of gas has the higher pressure.
[D] Your friend’s sample of gas has the higher pressure.
[E] None of these is correct.

17. A sample of N2 gas is contaminated with a gas (A) of unknown molar mass. The partial pressure of each gas is known to be 200. torr at 25°C. The gases are allowed to effuse through a pinhole, and it is found that gas A escapes at three times the rate of N2. The molar mass of gas A is:
[A] 84.0
[B] 9.33
[C] 3.11
[D] 252
[E] none of these

18. You have a 400-mL container containing 55.0% He and 45.0% Ar by mass at 25°C and 1.5 atm total pressure. You heat the container to 100°C.
 Calculate the total pressure.
[A] 1.20 atm
[B] 1.88 atm
[C] 2.01 atm
[D] 1.50 atm
[E] none of these

19. Given reaction 2NH3(g) + 3Cl2(g) ® N2(g) + 6HCl(g), you react 5.0 L of NH3 with 5.0 L of Cl2 measured at the same conditions in a closed container. Calculate the ratio of pressures in the container (Pfinal/Pinitial).
[A] 0.75
[B] 1.33
[C] 1.00
[D] 1.50
[E] none of these

20. You fill a balloon with 2.50 moles of gas at 28°C at a pressure of 1.20 atm.  What is the volume of the balloon?
[A] 22.4 L
[B] 51.5 L
[C] 4.79 L
[D] 56.0 L
[E] 61.8 L

21. What volume of H2O(g) measured at STP is produced by the combustion of 4.00 g of natural gas (CH4) according to the following equation?
	CH4(g) + 2O2(g) ® CO2(g) + 2H2O(g)
[A] 5.60 L
[B] 11.2 L
[C] 44.8 L
[D] 22.4 L
[E] 33.6 L

22. Which of the following is not an assumption of the kinetic molecular theory for a gas?
[A] Gases are made up of tiny particles in constant chaotic motion.
[B] Gas particles are very small compared to the average distance between the particles.
[C] Gas particles collide with the walls of their container in elastic collisions.
[D] The average velocity of the gas particles is directly proportional to the absolute temperature.
[E] All of these are correct.

23. A balloon contains an anesthetic mixture of cyclopropane (cp) and oxygen (O2) at 170 torr and 570 torr, respectively. What is the ratio of the number of moles of cyclopropane to moles of oxygen?
	
[A] 0.30
[B] 0.19
[C] 0.23
[D] 0.39
[E] 0.46

24. Which conditions of P, T, and n, respectively, are most ideal?
[A] high P, high T, high n
[B] low P, low T, low n
[C] low P, high T, low n
[D] low P, high T, high n
[E] high P, low T, high n

25. Which of the following is the best qualitative graph of P versus molar mass of a 1-g sample of different gases at constant volume and temperature?
[A] 
[B] 
[C] 
[D] 
[E] None of these

26. A vessel with a volume of 10.0 L contains 2.80 g of nitrogen gas, 0.403 g of hydrogen gas, and 79.9 g of argon gas. At 25°C, what is the pressure in the vessel?
[A] 0.471 atm
[B] 2.38 atm
[C] 3.20 atm
[D] 5.62 atm
[E] 6.43 atm

Reference: 5.2
[1] [B]

Reference: 5.3
[2] [A]

Reference: 5.4
[3] [B]

Reference: 5.3
[4] [C]

Reference: 5.5
[5] [E]

Reference: 5.8
[6] [B]

Reference: 5.4
[7] [A]

Reference: 5.4
[8] [C]

Reference: 5.3
[9] [D]

Reference: 5.5
[10] [B]

Reference: 5.7
[11] [C]

Reference: 5.3
[12] [B]

Reference: 5.4
[13] 1.54 g/L

Reference: 5.4
[14] [E]

Reference: 5.6
[15] [B]

Reference: 5.1
[16] [C]

Reference: 5.7
[17] [C]

Reference: 5.2-4
[18] [B]

Reference: 5.4
[19] [B]

Reference: 5.3
[20] [B]

Reference: 5.4
[21] [B]

Reference: 5.6
[22] [D]

Reference: 5.5
[23] [A]

Reference: 5.4
[24] [C]

Reference: 5.4
[25] [E]

Reference: 5.5
[26] [D]