Hole change in Gibbs free energy


In chemistry, a reaction quotient: Qr is a function of the activities or concentrations of the chemical species involved in a chemical reaction. In the special case that the reaction is at equilibrium the reaction quotient is constant and equal to the equilibrium constant which appears in the expression of the law of mass action. Chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time. Usually, this state results when the forward reaction proceeds at the same rate as the reverse reaction. When the reactants are dissolved in a medium of high ionic strength the quotient of activity coefficients may be taken to be constant. In a system that is not at equilibrium the hole change in Gibbs free energy can be calculated by the standard change of reaction in Gibbs free energy and the the energy of the reaction quotient.

Related formulas


ΔGHHole change in Gibbs free energy (J/mol)
ΔG Standard change in Gibbs free energy (J/mol)
Rmolar gas constant
TAbsolute temperature (K)
QrReaction quotient (dimensionless)