Lecture10, 1-30-08

Lecture10, 1-30-08 - 1. The temperature of 3.00 kg of...

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Unformatted text preview: 1. The temperature of 3.00 kg of ethane (C 2 H 6 ) is increased from 25.0C to 73.9C in a rigid vessel (constant volume). C v for C 2 H 6 = 44.6 J/Kmol. Which of the following expressions is equal to the internal energy change, E, for this process? Correct Answer E A. E = 48.9 K(44.6 J/Kmol) B. E = - 48.9 K(44.6 J/Kmol) C. E = 3 48.9 K(44.6 J/Kmol) D. E = -3 48.9 K(44.6 J/Kmol) E. None of the above 2. For nitrogen gas the values of C v and C p at 25C are 20.8 J K-1 mol-1 and 29.1 J K-1 mol-1, respectively. When a sample of nitrogen is heated at constant pressure, what fraction of the energy is converted to work? Correct Answer C A. 1.000 B. More than 0.500 C. Less than 0.500 D. 0.000 E. None of the above 3. One mole of an ideal gas with a volume of 22.4 L and a pressure of 1.0 atm is allowed to expand at constant T = 273 K into an evacuated bulb to give it a total volume of 224 L. What are the values of q and w for this gas expansion? Correct Answer A A. q = 0, w = 0 B. q = 20.2 Latm, w = 20.2 Latm C. q = 20.2 Latm, w = -20.2 Latm D. q = -20.2 Latm, w = 20.2 Latm E. q = 202 Latm, w = -202 Latm 4.4....
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This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

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Lecture10, 1-30-08 - 1. The temperature of 3.00 kg of...

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