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Quiz 4-solutions

Quiz 4-solutions - Version 038 Quiz 4 sparks(51150 This...

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Version 038 – Quiz 4 – sparks – (51150) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points What volume is occupied by 1.00 kg of helium at 5.00 C at a pressure of 735 Torr? 1. 5 . 90 × 10 3 L correct 2. 1 . 06 × 10 2 L 3. 5 . 60 × 10 3 L 4. 2 . 95 × 10 3 L 5. 5 . 97 × 10 5 L Explanation: (1 . 00 kg He) 1000 g 1 kg 1 mole He 4 . 0026 g He = 249 . 838 mol He T = 5 . 00 C + 273 . 15 = 278 . 15 K P = (735 Torr) 1 atm 760 Torr = 0 . 967105 atm P V = n R T V = n R T P = (249 . 838 mol)(0 . 08206 L · atm mol · K ) 0 . 967105 atm × (278 . 15 K) = 5896 . 5 L 002 10.0points What is the volume of 1.42 mol of ammonia at STP? 1. 22.4 L 2. 0.0634 L 3. 31.8 L correct 4. 541 mL Explanation: n = 1.42 mol Avogadro’s Law states that at the same temperature and pressure, equal volumes of all gases contain the same number of molecules. The standard molar volume of an ideal gas is taken to be 22 . 414 liters per mol at STP. 22 . 4 L mol × (1 . 42 mol) = 31 . 8 L 003 10.0points Two tanks (tank A and tank B) of gas are connected by a closed valve. Tank A is 5 liters and contains O 2 gas at a pressure of 24 atm.

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