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Unformatted text preview: Chem. 444 Instructor: Nancy Makri PROBLEM McQ 2014 Show that 2 2 1 1 ln ln V T V S C R T V = + for a constantpressure process if V C is taken from T 1 , V 1 to T 2 , V 2 assuming that V C is independ ent of temperature. Calculate the value of S if one mole of N 2 (g) is expanded from 20.0 dm 3 at 273 K to 300 dm 3 at 400 K. Take P C = 29.4 JK1 mol1 . ( ) ( ) rev V V q C T dT C T dT PdV nRdV dS T T T T V = = + = + 2 2 1 1 2 2 1 1 ln ln T V V V T V C dT RdV T V S C R T V T V = + = + Recall P V V P C C R C C R = + = So after the proper substitutions 1 1 30.6 S JK mol = PROBLEM McQ 2015 In this problem, we will consider a twocompartment system like that in Figure 20.4, except that the two subsystems have the same temperature but different pressures and the wall that separates them is flexible rather than rigid. Show that in this case, ( 29 B B A dV dS P P T = Interpret this result with regard to the sign of B dV when B A P P and when B A P P < ....
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This note was uploaded on 02/08/2012 for the course CHEM 444 taught by Professor Gruebele,m during the Fall '08 term at University of Illinois, Urbana Champaign.
 Fall '08
 Gruebele,M
 Mole

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