Standard change of reaction in Gibbs free energy


Gibbs free energy is a thermodynamic potential that measures the “usefulness” or process-initiating work obtainable from a thermodynamic system at a constant temperature and pressure (isothermal, isobaric). Gibbs energy (also referred to as ∆G) is also the chemical potential that is minimized when a system reaches equilibrium at constant pressure and temperature. Its derivative with respect to the reaction coordinate of the system vanishes at the equilibrium point.

Related formulas


ΔGStandard change of reaction free energy (J/mol)
Rmolar gas constant
TAbsolute temperature (K)
KEquilibrium constant at temperature T (dimensionless)