## Spontaneity in the Gibbs Eqn

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

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

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

Nico Edgar 4L
Posts: 32
Joined: Fri Sep 28, 2018 12:19 am

### Spontaneity in the Gibbs Eqn

If a reaction has negative delta H and negative delta S, will it be spontaneous at high or low temperatures??

2c_britneyly
Posts: 62
Joined: Fri Sep 28, 2018 12:16 am

### Re: Spontaneity in the Gibbs Eqn

It will be spontaneous at a low temperature.

Hedi Zappacosta 1E
Posts: 66
Joined: Fri Sep 28, 2018 12:27 am

### Re: Spontaneity in the Gibbs Eqn

Just look at the equation delta G=delta H - T delta S. If you plug in the numbers and delta G is negative, then it is spontaneous.

hazelyang2E
Posts: 57
Joined: Fri Sep 28, 2018 12:23 am

### Re: Spontaneity in the Gibbs Eqn

If a reaction has negative delta H and negative delta S, it will be spontaneous when the absolute values of Temperature x Delta S is greater than the absolute value of delta H because delta G will also be negative.

beckyolmedo1G
Posts: 34
Joined: Fri Sep 28, 2018 12:21 am

### Re: Spontaneity in the Gibbs Eqn

When both are negative it would be spontaneous at LOW temps. If both were positive, it would be spontaneous at HIGH temps.