Homework Answers
for any gas, entropy change = Cv*dT/T+ (dP/dT)VdV
at constant temperature, entropy change , deltaS= (dP/dT)VdV
(dS/dV)T= (dP/dT)V
but for Vanderwaal gas P= RT/(V-b)- a/V2
(dP/dT)V= R/(V-b)
(dS/dV)T= R/(V-b)
dS= R/(V-b)dV
when integrated, the equation is deltaS= R*ln(V-b)+C where c is integration constant.
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