## gibbs free energy

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

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

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

Ashley Bouma 1F
Posts: 30
Joined: Fri Sep 28, 2018 12:21 am

### gibbs free energy

I was wondering how the change in gibbs free energy relates to the spontaneity of a reaction?

105114680
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

### Re: gibbs free energy

If it is negative, the reaction is spontaneous.

Heesu_Kim_1F
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am

### Re: gibbs free energy

If delta G is negative, the reaction is spontaneous.
If delta G is positive, the reaction is not spontaneous.
Hope this helps!

Posts: 33
Joined: Fri Sep 28, 2018 12:22 am

### Re: gibbs free energy

How do you calculate Gibbs free energy?

Joon Chang 2F
Posts: 59
Joined: Fri Sep 28, 2018 12:25 am

### Re: gibbs free energy

MadelineHlobik wrote:How do you calculate Gibbs free energy?

$\Delta G=\Delta H-T\Delta S$

chris_tsai_4H
Posts: 52
Joined: Fri Sep 28, 2018 12:26 am

### Re: gibbs free energy

When delta G is negative, the system(reaction) is spontaneous.

KHuang1L
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

### Re: gibbs free energy

If the change in Gibbs free energy is positive, then the reaction is not spontaneous. If the change in Gibbs free energy is negative, then the reaction is spontaneous.

Posts: 33
Joined: Fri Sep 28, 2018 12:22 am

### Re: gibbs free energy

Do spontaneous reactions have to occur quickly? Or do they just happen randomly?

lizettelopez1F
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Joined: Fri Sep 28, 2018 12:19 am

### Re: gibbs free energy

If a reaction is spontaneous, it can either be spontaneous with all temperatures, spontaneous with low temperatures, or spontaneous with high temperatures. You can tell by looking at the values of delta H and delta S.

Ricardo Martin 1J
Posts: 63
Joined: Fri Sep 28, 2018 12:15 am

### Re: gibbs free energy

If free energy is negative (-) then the reaction is spontaneous and if it is positive (+) then the reaction is not spontaneous (requires energy).

Samantha Chang 2K
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

### Re: gibbs free energy

If Gibbs Free Energy is negative, it is spontaneous.