LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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The Gibbs–Duhem Relation
From Euler’s theorem, Eq. (4.6-3), we can write an
expression for dY, the differential of an extensive
quantity denoted by Y:
This equation represents the effect on Y of any
infinitesimal change in the state of the system such
as changing its temperature or pressure or adding
one of the substances. Considering Y to be a function
of T , P, and the n’s, we write another expression
for dY:
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