# Exam03answersvr278 - Cheung Anthony Exam 3 Due Nov 8 2006...

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1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. 001 (part 1 oF 1) 10 points Which describes Dalton’s Law? 1. The volume occupied by a given weight iF gas at constant temperature is inversely proportional to pressure. 2. The total pressure exerted by a mixture oF gases is the sum oF the pressures exerted by the individual gases in the mixture. correct 3. The volume occupied by a given weight oF gas at constant pressure is directly propor- tional to the absolute temperature. Explanation: Dalton’s Law states that the total pressure exerted by a mixture oF ideal gases is the sum oF the partial pressures oF those gases: P total = P A + P B + P C + ... under constant V , T . 002 (part 1 oF 1) 10 points IF the compression Factor Z is less than one For a given gas, which van der Waals coe±cient is the dominant one? 1. impossible to tell 2. a correct 3. b Explanation: Z factors of less than 1 have attractive forces dominating. 003 (part 1 oF 1) 12 points How many atoms oF argon occupy 1 mL iF the temperature is 300 C and the pressure is 1 . 00 × 10 - 3 Torr? 1. 1 . 68 × 10 13 correct 2. 3 . 22 × 10 13 3. 2 . 44 × 10 19 4. 1 . 28 × 10 16 5. 2 . 80 × 10 - 11 Explanation: 004 (part 1 oF 1) 10 points Rank the gases H 2 , CH 3 ², N 2 , C² 4 , H² From leFt to right in terms oF the increased non-ideality that results From a reduction in the e³ective pressure oF the gas due to inter- molecular Forces. 1. H 2 , CH 3 ² , N 2 , 4 , 2. , CH 3 ² , 4 , N 2 , H 2 3. 4 , CH 3 ² , N 2 , , H 2 4. H 2 , N 2 , 4 , CH 3 ² , correct 5. H 2 , , N 2 , CH 3 ² , 4 6. H 2 , N 2 , , CH 3 ² , 4 Explanation: The stronger the intermolecular Forces present, the greater the non-ideality. Induced Dipole H 2 smallest , most ideal N 2 4 largest Dipole - dipole CH 3 ² Hydrogen Bonding H² least ideal 005 (part 1 oF 1) 15 points What is the pressure inside a system when the system-side column in an open mercury manometer is 75.0 mm lower than the atmo- sphere side when the atmospheric pressure is 735 mm Hg? 1.

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Exam03answersvr278 - Cheung Anthony Exam 3 Due Nov 8 2006...

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