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4) Consider a substance that undergoes a phase transition at To=300K and pressure Po=5bar.
The Gibbs free energy per mole at constant pressure and temperature near the transition is
shown below.
G (kJ/mol)
a)
What type of phase transition is
600
this? Why?
400
200
P (bar)
4
10
b)
From the figure, estimate the difference in volume AV between the two phases.

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