LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Equilibrium between Phases
An equilibrium two-phase
simple system containing
several substances is depicted
schematically in Figure 5.1.
This system is closed to the
surroundings, but each phaseis
open to the other and both
phases are at the same
temperature and pressure. If
the contribution of the surface
area between the phases is
negligible, the Gibbs energy of
the system is the sum of the
Gibbs energies of the
two phases:
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