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The behavior of G during a phase change.

Consider how the molar Gibbs energy changes when ice melts:

**Figure 15-3:** Plot of molar free energy of solid and liquid phases against temperature. **The curve with the lowest value of indicates which phase is most stable at that particular temperature.**
$\begin{figure}\resizebox{6in}{!} {\epsfig{file=figures/10-1A.eps}} \end{figure}$

**Figure 15-4:** Plot of phase fractions of the molar free energy of solid and liquid phases against enthalpy. The molar Gibb's free energy of each phase is equal during the transformation **regardless of how much material is present.**
$\begin{figure}\resizebox{6in}{!} {\epsfig{file=figures/10-1B.eps}} \end{figure}$

W. Craig Carter 2002-10-08