vYKEc9-Exam 3 - Livasy, David Exam 3 Due: Oct 27 2006, 5:00...

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Livasy, David – Exam 3 – Due: Oct 27 2006, 5:00 pm – Inst: Donna C Lyon 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Which of the following can form intermolecu- lar hydrogen bonds? 1. CH 3 CH 2 CH 2 CH 2 CH 3 2. AsH 3 3. CH 3 OH correct 4. CH 3 OCH 3 5. HBr Explanation: 002 (part 1 of 1) 10 points A mixture of 0 . 75 mol H 2 gas and 0 . 75 mol N 2 gas is introduced into a 15 liters container having a pinhole leak at 30 C. After a period of time, which of the following is true? 1. The partial pressure of N 2 exceeds that of H 2 in the container. correct 2. The partial pressures of the two gases change, but they remain equal. 3. The partial pressure of H 2 exceeds that of N 2 in the container. 4. The partial pressures of both gases in- crease above their initial values. Explanation: X N 2 = 0 . 79 P total = 1 atm Because of the pinhole leak, the con- tainer will become equilibrated with the at- mosphere. Air is composed of 79% N 2 , 20% O 2 , and 1% other gases. Eventually the gases in the container will have the same ratios as air and the pressure will be 1 atm. X N 2 = 0 . 79 P N 2 = X N 2 P total = 0 . 79 (1 atm) = 0 . 79 atm . The partial pressure of N 2 exceeds all other gases. 003 (part 1 of 1) 10 points Real gases behave most nearly like ideal gases at 1. low temperatures and high pressures. 2. high pressures and low molar masses. 3. low temperatures and low pressures. 4. high temperatures and high pressures. 5. high temperatures and low pressures. correct Explanation: 004 (part 1 of 1) 10 points A 0.479 g sample of nitrogen, oxygen or neon gas occupies a volume of 265 mL at 157 kPa and 20 C. What is the molar mass and iden- tity of the gas? 1. 14 . 0 g · mol - 1 , N 2. 28 . 0 g · mol - 1 , N 2 correct 3. 32 . 0 g · mol - 1 , O 2 4. 20 . 1 g · mol - 1 , Ne 5. 16 . 0 g · mol - 1 , O Explanation: 005 (part 1 of 1) 10 points A gaseous mixture made from 6.00 grams of oxygen gas and 9.00 grams of chlorine gas is placed in a 15.0 L vessel at 10.0 degrees Celsius. What is the total pressure in the vessel?
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Livasy, David – Exam 3 – Due: Oct 27 2006, 5:00 pm – Inst: Donna C Lyon 2 1. 0.800 atm 2. 0.488 atm correct 3. 1.00 atm 4. 0.655 atm
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This note was uploaded on 02/04/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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vYKEc9-Exam 3 - Livasy, David Exam 3 Due: Oct 27 2006, 5:00...

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