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## Homework Statement

Hi, I have the following task:

Translated into English, that means:

" For Cpm and Cvm of gases the following relationship is true:

**(1)**

a) Show with the relationship (1), that for an ideal gas Cpm - Cvm = R is valid

b) Deduce from equation (1) and the tripple product rule Cpm - Cvm for a Van der Waals gas (dependent on Vm, T and also R, a and b)"

I managed to solve a) but I don't know how to solve b)

Can someone help me?

## Homework Equations

Tripple product rule: https://en.wikipedia.org/wiki/Triple_product_rule

Van der Waals equation: https://de.wikipedia.org/wiki/Van-der-Waals-Gleichung

## The Attempt at a Solution

see above