Find thermal capacity of a Van der Waals gas

[pines-demon]

So for showing that $[\frac {\partial C_V} {\partial V}]_T=0$ I can use the link you've sahred ...
So do you see any other problem in my final answer?

Your argument goes like this:

1. Assume (or prove) that $C_V$ does not depend on the volume
2. Use the equation of state to derive the rhs of Mayer's relation
3. Assume $C_V=\frac32nR$
4. Insert (3) in Mayer's relation

However step 1 was not needed.

 

[MatinSAR]

Your argument goes like this:

1. Assume (or prove) that $C_V$ does not depend on the volume
2. Use the equation of state to derive the rhs of Mayer's relation
3. Assume $C_V=\frac32nR$
4. Insert (3) in Mayer's relation

However step 1 was not needed.

Thanks again for your time @pines-demon ...