## Gibbs Free Energy and Spontaneity

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

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

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

Jared Smith 1E
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

### Gibbs Free Energy and Spontaneity

So I know that when delta G is negative, the forward reaction is spontaneous. Is it then correct to assume that whenever delta G is positive, the reverse reaction is spontaneous?

Julia Ward 2C
Posts: 27
Joined: Wed Nov 16, 2016 3:03 am

### Re: Gibbs Free Energy and Spontaneity

Yes I believe so.

Rishi Khettry 1L
Posts: 29
Joined: Fri Sep 29, 2017 7:05 am

### Re: Gibbs Free Energy and Spontaneity

Yes with a positive deltaG, the reaction is not spontaneous in the forward direction but will be spontaneous if reversed.
With a negative deltaG, the reaction IS spontaneous in the forward direction but not so if reversed.