Exam03answers pg5 - Explanation: Only molecules with H...

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4. 6 . 603 g / L 5. 2 . 935 g / L Explanation: T = 128 + 273 . 15 = 401 . 15 K P = 716 torr · atm 760 torr = 0 . 942105 atm n V = ? P V = nR T n V = P R T = (0 . 942105 atm) (0 . 08206 L · atm mol · K )(401 . 15 K) = 0 . 0286194 mol L p 0 . 0286194 mol L P 153 . 81 g mol = 4 . 402 g / L 019 (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. 820 kPa 2. 10.0 kPa 3. 108 kPa correct 4. 75 kPa 5. 88.0 kPa Explanation: 020 (part 1 of 1) 10 points Which of the following molecules A) CH 3 CH 2 OH C) CH 3 COOH B) CH 3 CHO D) CH 3 OCH 3 are likely to form hydrogen bonds? 1. C and D only 2. A and B only 3. All are likely to form hydrogen bonds. 4. A and D only 5. A and C only correct 6. B and C only 7. None forms hydrogen bonds. 8. Another combination of compounds 9. B and D only
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Unformatted text preview: Explanation: Only molecules with H attached to the electronegative atoms N, O, and F can hy-drogen bond. Of the molecules given, only CH 3 COOH and CH 3 CH 2 OH have hydrogen attached to oxygen, so these are the only ones that can undergo hydrogen bonding. 021 (part 1 of 1) 12 points A sample of N 2 gas occupies a volume of 746 mL at STP. What volume would N 2 gas occupy at 155 ◦ C at a pressure of 368 torr? 1. 566 mL 2. 588 mL 3. 323 mL 4. 983 mL 5. 3295 mL 6. 2415 mL correct 7. 312 mL 8. 1792 mL Explanation: V 1 = 746 mL T 1 = 273 . 15 ◦ K P 1 = 1atm = 760torr T 2 = 155 ◦ C = 428 K P 2 = 368torr Combined Gas Law: P 1 V 1 T 1 = P 2 V 2 T 2...
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This note was uploaded on 01/23/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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