R = 0.082 L atm/mole K

Chemistry 1210 Quiz #6A Oct 7, 2002 Dr. B. Jackson

61. Code A

62. A gas occupies 4 liters at 2 atm pressure. What would the pressure have to be for the volume to be 6 liters?

a) 3 atm b) 1.33 atm c) 4 atm d) 1 atm e) 0.75 atm

63. How many moles are present in 5.6 liters of a gas at STP?

a) 5 b) 0.25 c) 11.2 d) 0.5

64. A gas occupies 6 liters at 27EC. How many liters will it occupy at 127EC?

a) 6.5 b) 4.5 c) 8 d) 7.2

65. A sample of gas at 77EC and 1.33 atm occupies a volume of 50.3 L. How many moles of the

gas are present?

a) 28.7 b) 0.43 c) 2.33 d) 10.6 e) 3.1

66. The partial presures of a mixture of gases were as follows: oxygen, 210 mm Hg;

nitrogen, 560 mm Hg; and carbon dioxide, 15 mm Hg. The total pressure in the mixture was 790 mm Hg. Was there another gas in the mixture?

a) yes b) no

67. The inside pressure of an automobile tire is 1.8 atm at a temperature of 20EC. What will the pressure in the tire be if, after 10 miles of driving, the temperature of the tire increases to 46EC?

a) 2.2 atm b) 4.1 atm c) 0.8 atm d) 1.96 atm e) 1.65 atm

68. A sample of 30.0 mL of Kr gas is at 756 mm Hg at 25EC. What is the new volume if the pressure is decreased to 325 mmHg and the temperature is decreased to -12.5EC?

a) 61 mL b) 6.1 mL c) 11mL d) 80 mL

69. How many molecules of CO are there in 100 L of CO at STP?

a) 0.224 b) 1.3 x 10²³ c) 2.7 x 10²⁴ d) 6.02 x 1023

70. A sample of cyanogen gas weighing 6.802 g occupies 3.74 L at 25EC and 650 mm Hg. What is the molecular weight of cyanogen?

a) 52 b) 76 c) 89 d) 102 e) 19

Ans: 61a; 62b; 63b; 64c; 65c; 66a; 67d; 68a; 69c; 70a

Wednesday, March 21, 2007 01:28:01 PM