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Test 4 - 1 Arrange the following gases in order of...

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1) Arrange the following gases in order of increasing average molecular speed at 25 e C: He, O 2 , CO 2 , N 2 A) He < O 2 < N 2 < CO 2 B) CO 2 < N 2 < O 2 < He C) CO 2 < He < N 2 < O 2 D) He < N 2 < O 2 < CO 2 E) CO 2 < O 2 < N 2 < He Answer: E Page Ref: Sec. 10.8 2) A 0.325 L flask filled with gas at 0.914 atm and 19 e C contains __________ mol of gas. A) 9.42 B) 12.4 C) 1.48 x 10 -2 D) 1.24 x 10 -2 E) 80.7 Answer: D Page Ref: Sec. 10.4 3) SO 2 (5.0 g) and CO 2 (5.0 g) are placed in a 750 mL container at 50 e C. The partial pressure of SO 2 in the container was __________ atm. A) 4.02 B) 1.60 C) 2.76 D) 6.78 E) 0.192 Answer: C Page Ref: Sec. 10.6 4) If 129.3 g of a gas occupies 10.0 L at STP, 50.75 g of the gas will occupy __________ L at STP. A) 50.8 B) 12.9 C) 5.08 D) 25.5 E) 3.92 Answer: E Page Ref: Sec. 10.3 5) The density of nitric oxide (NO) gas at 1.21 atm and 54.1 e C is ________ g/L. A) 0.0451 B) 0.273 C) 1.35 D) 0.740 E) 8.2 Answer: C Page Ref: Sec. 10.5 1 6) Which statement about atmospheric pressure is false? A) Air actually has weight. B) Atmospheric pressure prevents water in lakes, rivers, and oceans from boiling away. C) The warmer the air, the lower the atmospheric pressure. D) With an increase in altitude, atmospheric pressure increases as well. E) As air becomes thinner, its density decreases. Answer: D Page Ref: Sec. 10.2, 10.3 7) A pressure of 1.00 atm is the same as a pressure of __________ of mmHg. A) 193 B) 760.0 C) 33.0 D) 101 E) 29.92 Answer: A Page Ref: Sec. 10.2 8) The pressure in a 12.2 L vessel that contains 2.34 g of carbon dioxide, 1.73 g of sulfur dioxide, and 3.33 g of argon, all at 42 e C is __________ mmHg.
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