Question

Why is Gibbs free energy 0 at phase change?

Answer 1

so why is Gibbs free energy zero for phase changes at constant temperature and pressure?for example if you're supercooled liquid water Tu -10° c let the water freeze and do this in a way that the final state is solid water at -10° C the change in Gibbs free energy will be negative G=0if at T =0C.

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