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At equilibrium, DeltaG=0 because the forward and backward reaction rates are equal. So the formula for nonstandard conditions (including not at equilibrium) is Delta G= DeltaG* + RT lnQ, where Q is the reaction quotient ([Products]/[Reactants]). At equilibrium, the Q variable would become K.
Eileen Si 1G wrote:Why does Gibbs free energy depend on the equilibrium constant and pressure? Also, is Gibbs free energy a state function?
Yes! Gibbs free energy, G, is a state function. It it determined by its current state. This allows us to calculate the chnage based upon the final and inital values-- this is similar to entropy, S, and enthalpy, H.
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