603_Physics ProblemsTechnical Physics

603_Physics ProblemsTechnical Physics - Chapter 21 Section...

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Chapter 21 605 Section 21.2 Molar Specific Heat of an Ideal Gas P21.12 En R T int = 3 2 ∆∆ R T int mol J mol K K J == = 3 2 3 2 3 00 8 314 2 00 74 8 .. . . af bg P21.13 We us the tabulated values for C P and C V (a) Qn C T P = 1 00 420 300 3 46 mol 28.8 J mol K K kJ a f (b) C T V int mol 20.4 J mol K K kJ = 100 120 245 (c) WQE =− + =− + = − int kJ kJ kJ 346 101 . P21.14 The piston moves to keep pressure constant. Since V nRT P = , then V nR T P = for a constant pressure process. C TnC RT PV + so T Q nC R Q nR R Q nR V = + = + = 52 2 7 and V nR P Q nR Q P QV nRT = F H G I K J 2 7 2 7 2 7 V = × = 2 7 440 10 500 8314 300 252 3 . J L mol J mol K K L ej Thus, VV V fi =+ = + =
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