## 9.65

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

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

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

Gavin Kellerman 1D
Posts: 17
Joined: Sat Jul 09, 2016 3:00 am

### 9.65

Why does Gibbs Free Energy predict the stability of molecules with temperature change?

skalvakota2H
Posts: 52
Joined: Sat Jul 22, 2017 3:01 am

### Re: 9.65

The thermodynamic stability of a molecule means that the formation is favored, so the reaction is spontaneous. The way by which we can determine spontaneity from Gibbs Free Energy is by using the equation deltaG = deltaH - TdeltaS.
This allows us to compare how altering the values of the variables will result in either a less negative value for Gibbs Free Energy. Without using specific values, we can deduce as that an increase in temperature will increase the overall value of the TdeltaS term, and if deltaS is a negative number, this will make the overall expression more positive, thus deeming the compound less stable.