## Gibbs Free Energy Signs

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

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

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

Beatrice Petelo 1F
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

### Gibbs Free Energy Signs

What are the signs for gibbs free energy for both spontaneous and non-spontaneous reactions?

Ricky Ma DIS 4E
Posts: 72
Joined: Fri Sep 28, 2018 12:27 am

### Re: Gibbs Free Energy Signs

a negative gibbs free energy means that it is spontaneous. A postive gibbs free energy means that it is not spontaneous.

ryanhon2H
Posts: 60
Joined: Fri Sep 28, 2018 12:28 am

### Re: Gibbs Free Energy Signs

Negative ∆G means the forward reaction is spontaneous. Positive ∆G means the forward reaction is not spontaneous, but the reverse reaction is. If ∆G equals 0, that means the system is in equilibrium.

Nandhini_2K
Posts: 60
Joined: Fri Apr 06, 2018 11:03 am

### Re: Gibbs Free Energy Signs

Negative = Spontaneous
Positive = Non-Spontaneous

Alyssa Wilson 2A
Posts: 65
Joined: Fri Sep 28, 2018 12:18 am

### Re: Gibbs Free Energy Signs

When K=1, Gibbs free energy will =0.
When K<1, Gibbs free energy will be + and will result in a non spontaneous reaction.
When K>1, Gibbs free energy will be - and will be a spontaneous reaction.