practice exam1 with solutions

practice exam1 with solutions - 1. Two moles of an ideal...

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1. Two moles of an ideal gas undergo a reversible cyclic process 1 Ø 2 Ø 3 Ø 1 shown below. A. What is the total work W done on the gas? The work is equal to the area inside the curve with the minus sign: W = -1/2 J B . What is the total heat q absorbed by the gas? we have q+W = U. Since U is a function of state its change is zero in a cyclic process (the initial and the final states are the same) so that q+W = 0. q = -W = ½ J C . What is S in this process? S is a function of state so S=0 in any cyclic process D . What is H in this process? H=0 (H is a function of state) E, F, G, and H: answer questions A, B, C, D assuming that the gas is not ideal and is described by the following equation of state: () P Vb R T −=
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Solution : we did not have to use the equation of state when solving A, B, C, D. The result does not depend on the equation of state so the answers to E,F,G,H are exactly the same as those to A,B,C,D, respectively. E. W=- ½ J F. q = ½ J G. S=0 H. H=0 2 . Two moles of an ideal gas undergo a process described by the following equation: V = a T 2 How does the pressure (P) depend on the temperature (T) in this process?
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This note was uploaded on 09/06/2009 for the course CH 353M taught by Professor Lim during the Spring '08 term at University of Texas.

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practice exam1 with solutions - 1. Two moles of an ideal...

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