Exam03answers pg4 - Cannot be determined 6. 0.45...

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013 (part 1 of 2) 12 points Calculate the ratio of the potential energies for the interaction of a water molecule with a Na + ion (of radius 102 pm) and with a K + ion (or radius 138 pm). 1. 1 . 8 correct 2. 1.1 3. None of these 4. 3.2 5. 2.5 6. 0.72 7. 2.9 Explanation: r Na = 102 pm r K = 138 pm. The energy is E p -| z | μ r 2 , so the ratio is E Na E K = | z Na | r 2 K | z K | r 2 Na = | 1 | (138 pm) 2 | 1 | (102 pm) 2 = 1 . 83045 014 (part 2 of 2) 10 points Which ion will attract a water molecule more strongly? 1. Na + correct 2. K + 3. Equal attractions Explanation: The water molecule will be more strongly attracted to the Na + ion because of its smaller radius. 015 (part 1 of 1) 12 points A 5.0 L Fask containing O 2 at 2.00 atm is connected to a 3.0 L Fask containing H 2 at 4.00 atm and the gases are allowed to mix. What is the mole fraction of H 2 ? 1. 0.67 2. 0.55 correct 3. 0.25 4. 0.33 5.
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Unformatted text preview: Cannot be determined 6. 0.45 Explanation: 016 (part 1 of 1) 10 points A sample of gas is MOST likely to act ideally under which of the following conditions? 1. low T and low P 2. low T and high P 3. high T and high P 4. high T and low P correct Explanation: 017 (part 1 of 1) 10 points If the compression factor Z is less than one for a given gas, which van der Waals coecient is the dominant one? 1. b 2. impossible to tell 3. a correct Explanation: Z factors of less than 1 have attractive forces dominating. 018 (part 1 of 1) 12 points What is the density of carbon tetrachloride vapor at 714 torr and 125 C? 1. 4 . 402 g / L correct 2. 5 . 503 g / L 3. 3 . 522 g / L...
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