This is the same as for the binary case except for calculating dT/dP. The equilibrium pressure, PT, at a specified temperature, T, for a constant composition multicomponent mixture is a function of the vapor pressure, mole
fraction, and activity coefficient for each component and is defined:
where n is the number of components and P, is the vapor pressure at T for the ith component.
Differentiating, we get:
dPT 1
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