The formula for Gibbs free energy is G = H - TS
Explanation:
Gibbs free energy refers a form of thermodynamic potential like Helmholtz free energy. It depends on state functions like internal potential energy, pressure, volume, temperature and entropy.
Mostly, it is the measure of reversibility or spontaneity of the chemical reaction. The change in the Gibbs free energy between the reactants and products should be less than zero or minimised to have a spontaneous or reversible chemical reaction.
The mathematical representation is,
G = H - TS
Here, H= U+PV, H is the enthalpy of the reaction, the measure of heat energy required to start a chemical reaction, T is the temperature and S is the entropy, the measure of randomness caused in the chemical reaction.