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Oct 13 HW-solutions

# Oct 13 HW-solutions - scrushy(mgs972 Oct 13 HW sparks(50975...

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scrushy (mgs972) – Oct 13 HW – sparks – (50975) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Preview sections 5.6, 5.7, and 5.10 before our next class. 001 10.0 points A lungful of air (333 cm 3 ) is exhaled into a machine that measures lung capacity. If the air is exhaled from the lungs at a pressure of 2 . 19 atm at 47 . 6 C but the machine is at ambient conditions of 0 . 958 atm and 23 C, what is the volume of air measured by the machine? Correct answer: 702 . 831 cm 3 . Explanation: T 1 = 47 . 6 C + 273 = 320 . 6 K P 1 = 2 . 19 atm T 2 = 23 C + 273 = 296 K P 2 = 0 . 958 atm V 1 = 333 cm 3 Because P , V , and T change, P 1 · V 1 T 1 = P 2 · V 2 T 2 V 2 = P 1 · V 1 · T 2 P 2 · T 1 = (2 . 19 atm) (333 cm 3 ) (296 K) (0 . 958 atm) (320 . 6 K) = 702 . 831 cm 3 . 002 10.0 points Which gas is most dense at 1 atm and 25 C? 1. nitrogen monoxide 2. carbon monoxide 3. nitrogen dioxide correct 4. hydrogen cyanide 5. hydrogen sulfide Explanation: The ideal gas law is P V = n R T n V = P R T with unit of measure mol/L on each side.

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Oct 13 HW-solutions - scrushy(mgs972 Oct 13 HW sparks(50975...

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