Class25

# Class25 - 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

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3/5/12 Oregon State University PH 202, Lecture 25 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: Gas stays at constant pressure . W = – P V E th = Q + W = Q P V If gas is ideal: V / T is constant E th = (3/2) P V Q = (5/2) P V Isochoric: Gas stays at constant volume . W = 0 (because V = 0) E th = Q + W = Q If gas is ideal: P / T is constant E th = (3/2) V P Q = (3/2) V P

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3/5/12 Oregon State University PH 202, Lecture 25 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 .
3/5/12 Oregon State University PH 202, Lecture 25 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. ±

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## This note was uploaded on 03/10/2012 for the course PH 202 taught by Professor Staff during the Winter '08 term at Oregon State.

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Class25 - 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

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