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Unformatted text preview: Version 038 Quiz 4 sparks (51150) 1 This printout should have 5 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points 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 RT V = n R T P = (249 . 838 mol)(0 . 08206 L atm mol K ) . 967105 atm (278 . 15 K) = 5896 . 5 L 002 10.0 points 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 Avogadros 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...
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This note was uploaded on 04/03/2012 for the course CHEM 56920 taught by Professor Sparks during the Spring '12 term at University of Texas at Austin.
 Spring '12
 SPARKS

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