Reversible processes (processes which may be made to proceed in the forward or reverse direction by the (infinitesimal) change of one variable, ultimately reach a point where the rates in both directions are identical, so that the system gives the appearance of having a static composition at which the Gibbs energy, G, is a minimum. At equilibrium the sum of the chemical potentials of the reactants equals that of the products, so that
Gr = Gr0 + RT ln K = 0
Gr0 = -RT ln KThe equilibrium constant, K, is given by the mass-law effect.
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