LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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The most we can do is to consider an isothermal
process that can be carried out once at temperature
T 1 and a fixed pressure P and again at temperature
T 2 and pressure P. We write Eq. (4.4-16) once for the
initial state and once for the final state. The
difference of these equations gives
where ∆G(T , P) and ∆S(T , P) pertain to a process
at a constant temperature T and a constant pressure
P. Equation (4.4-17) does not mean that we are
considering a nonisothermal process. It gives the
difference between ∆G for an isothermal process
carried out at T 2 and ∆G for the same isothermal
process carried out at T 1 .
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