Dependence of GE on temperature and pressure
The idea of the molar excess property has been introduced in section 6.5 with the following definition:
ME = M – Mid(6.163)
Typically the property M can be an intensive property such as: V, U, H, S, G, A, etc. The relations between the molar excess properties of V, H and G is particular significant for description of non-ideal solution thermodynamics. One may start from the generic total derivative of the Gibbs free energy for a real solution and an ideal solution in the same way as eqns. 5.27 and 5.28:

One may write the same equation specifically for an ideal solution, whence:
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Thus subtracting eqn. 6.165 from 6.164: | ||
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Thus we may write the following further generative relations:
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And further:![]()
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