Equations of State

1. The problem statement, all variables and given/known data

This is just a general question. I don't need any help with the work and just be lot quicker. I am given an equation of state for a gas (it's not the Ideal gas or van der waals, something just made up) and I need to find an experssion for the latent heat for vaporization. There are stuff in my books to calculate that.

I am just wondering if I need to know the equation of state for the liquid phase? Technically, there is a coexistence of the gas and liquid. If it was an ideal gas, then I can see it holding though.

2. Relevant equations

3. The attempt at a solution

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