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https://doi.org/10.1351/goldbook.C01023
Reversible processes [processes which may be made to proceed in the forward or reverse direction by the (infinitesimal) change of one @V06600@], 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: $\Delta G_{\text{r}} = \Delta G_{\text{r}}^{o}+R\ T\ \ln K=0$ $\Delta G_{\text{r}}^{\,\unicode{x26ac}} = -R\ T\ \ln K$ The @E02177@, $$K$$, is given by the @M03725@.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1114 [Terms] [Paper]