## Spontaneous vs Not Spontaneous

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

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

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

Mona El Masri 1F
Posts: 34
Joined: Fri Sep 28, 2018 12:20 am

### Spontaneous vs Not Spontaneous

If the Gibbs Free Energy of the reaction is positive, does that always mean the reaction is not spontaneous? In other words, does it have to be negative to be spontaneous?

Reva Kakaria 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am
Been upvoted: 1 time

### Re: Spontaneous vs Not Spontaneous

Yes, if delta G is positive, the reaction is always not spontaneous.

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

### Re: Spontaneous vs Not Spontaneous

Yes the reaction is only spontaneous if the free energy is negative (-).

Daniel Lai
Posts: 65
Joined: Fri Sep 28, 2018 12:28 am

### Re: Spontaneous vs Not Spontaneous

Negative delta G is spontaneous and positive is not spontaneous

Sarah_Kang_2K
Posts: 72
Joined: Fri Sep 28, 2018 12:23 am

### Re: Spontaneous vs Not Spontaneous

Delta G must be negative in order for a reaction to be spontaneous.

Nico Edgar 4L
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Joined: Fri Sep 28, 2018 12:19 am

### Re: Spontaneous vs Not Spontaneous

Gibbs free Energy is our best indicator of spontaneity. If it is negative the reaction will be spontaneous, if not it will be non-spontaneous.

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

### Re: Spontaneous vs Not Spontaneous

Yes, when delta G is negative it is spontaneous and when delta G is positive it is not spontaneous. When delta. G is 0, it is at equilibrium.

Katelyn Pham 4E
Posts: 30
Joined: Fri Sep 28, 2018 12:21 am

### Re: Spontaneous vs Not Spontaneous

A spontaneous reaction must release free energy so delta G must be negative to be spontaneous.