Problem

Other state variables useful for characterizing different classes of processes can be defi...

Other state variables useful for characterizing different classes of processes can be defined from Eint, S, P, and V. These include the enthalpy, H = Eint + pV, the Helmholtz free energy, A = ElntTS, and the Gibbs free energy, G = Eint + pV − TS.

a)    Write the differential equations for dH, dA, and dG.


b)    All of these are also exact differentials. What relationships follow from this fact?

Use the First Law to simplify.

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