## Spontaneous Reactions and Relation to Delta G°

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

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

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

Kathleen Vidanes 1E
Posts: 62
Joined: Fri Sep 29, 2017 7:07 am

### Spontaneous Reactions and Relation to Delta G°

If a reaction is spontaneous, why does that imply that Delta G°of the reaction is positive?

Rucha Kulkarni 2A
Posts: 43
Joined: Fri Sep 29, 2017 7:05 am

### Re: Spontaneous Reactions and Relation to Delta G°

Delta G is negative for spontaneous reactions.
If you see the equation for delta G: delta G(system)=delta H(system)-T*delta S
The sign for delta G is the opposite for delta S of the system
And since delta S has to be positive for spontaneous, delta G is negative.