LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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The Temperature Dependence of the Gibbs
Energy
From Eq. (4.2-19), if the pressure is constant and the
system is closed,
Integration of this equation at constant pressure
would give a relation for ∆G for a constant-pressure
temperature change.
We cannot use this relation, because a constant can
be added to the value of the entropy without any
physical effect. Adding a constant to S would change
the value of the integrand in Eq. (4.4-16), changing
the value of the integral.
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