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0301 Notes

# 0301 Notes - Graphing the Work Done by a Gas The work done...

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3/1/10 Oregon State University PH 202, Lecture 24 1 Graphing the Work Done by a Gas The work done by a gas during any thermal process is the area under its P-V graph for that process . Isobaric: System stays at constant pressure . W = – P ± V = – P ( V f V i ) V / T = const. ± E th = Q + – P ( V f V i ) = Q P ( V f V i ) Isochoric: System stays at constant volume . W = 0 (because ± V = 0) P / T = const. ± E th = Q

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3/1/10 Oregon State University PH 202, Lecture 24 2 A 2-liter cylinder of monatomic ideal gas is heated isochorically from 1 x 10 5 Pa to 4 x 10 5 Pa. Then it expands isobarically to 10 liters. How much total work is done on the gas in these two processes? 1. –4800 J 2. –4000 J 3. –3200 J 4. –2400 J 5. None of the above .
3/1/10 Oregon State University PH 202, Lecture 24 3 As we’ve seen, a system of ideal gas can do work (or have work done on it) anytime there is a change in its volume. ± ± ( PV ), the magnitude of the change in PV , is the amount of that work. This is easy to see and calculate when P is constant—an isobaric process:

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0301 Notes - Graphing the Work Done by a Gas The work done...

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