## When does DeltaG=0

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

Jonathan Enciso 1C
Posts: 16
Joined: Fri Jun 17, 2016 11:28 am

### When does DeltaG=0

Why does DeltaG=0 when there is a phase change?

Vivian Wang 3J
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Joined: Wed Sep 21, 2016 2:57 pm
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### Re: When does DeltaG=0

$\Delta G = 0$ only when the system is at equilibrium.

For a phase change, that means that the reaction is taking place under conditions at which the two phases are at equilibrium.
For example, when liquid water freezes, the ice must be formed at $0 C\degree$ and 1 bar pressure, where the reactants and products, in this case, liquid water and ice, are in equilibrium.