## Gibbs and K value

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

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

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

WYacob_2C
Posts: 102
Joined: Sat Jul 20, 2019 12:16 am

### Gibbs and K value

Can someone explain how the K value can impact the sign of delta G. Thank you in advance.

Lara Kristine Bacasen 1L
Posts: 110
Joined: Sat Jul 20, 2019 12:16 am
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### Re: Gibbs and K value

The K value can tell you if it is spontaneous or not. A spontaneous reaction has a negative delta G and a large K value. A non-spontaneous reaction has a positive delta G and a small K value.

HuyHa_2H
Posts: 100
Joined: Wed Sep 11, 2019 12:15 am

### Re: Gibbs and K value

The effects can be seen in the equation deltaG = -RTlnK. If K is greater than 1, then delta G is negative indicating spontaneity whereas if K is less than 1, then delta G is positive indicating a nonspontaneous process.

Asha Agarwal 1E
Posts: 51
Joined: Fri Aug 30, 2019 12:16 am

### Re: Gibbs and K value

If the reaction is at equilibrium, then Q = K, so you can substitute in K for Q and the ∆G will depend on K.