Relation between heat capacities and van der Waals equation

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1. Oct 27, 2017

patrickmoloney

I got $$\dfrac{RT}{1-\frac{2a}{V^3}\frac{(V-b)^2}{RT}}$$. But I'm happy enough that I know how to solve the problem should it come up. Thanks guys.

2. Oct 27, 2017

Staff: Mentor

There should not be a T in the numerator.

3. Oct 27, 2017

patrickmoloney

I got it from $$T \Bigg{(}\dfrac{\partial p}{\partial T}\Bigg{)}_V$$

I couldn't get an $R$ on its own

4. Oct 27, 2017

Staff: Mentor

Too bad. Check the units on your expression for the difference between the heat capacities. It doesn't have the correct units.