## Gibbs Free Energy and equilibrium

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

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

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

Cecilia Jardon 1I
Posts: 74
Joined: Fri Sep 28, 2018 12:16 am

### Gibbs Free Energy and equilibrium

In lecture on Friday in the notes it said if G(r) does not equal G(p) then the system (rxn) is not at equilibrium. Can someone explain why that is?

Meachelle_Lum_1I
Posts: 92
Joined: Fri Sep 28, 2018 12:24 am

### Re: Gibbs Free Energy and equilibrium

Equilibrium means the forward rate equals the reverse rate. Free energy refers to the amount of energy available to do work. So when the energy of the reactants/products aren't equal, the system is not at equilibrium.

Fayez Kanj
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am
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### Re: Gibbs Free Energy and equilibrium

It is also important to note that if deltaG = 0, then the rate of the forward reaction equals the rate of the backwards reaction, meaning that the reaction is at equilibrium.

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