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Homework Statement:

Consider a substance whose vapor is at equilibrium at temperature T with it's liquid phase. Calculate the heat capacity C = dQ / dT as a function of n, c_p(T) and q. Use Maxwell relationships and the clausius clapeyron equation and treat the vapor as an ideal gas.
How can I go on?
Relevant Equations:
 dp/dT=q/(T(v_gv_f))