Equilibrium is the condition where the concentration of the reactant molecule is equal to the concentration of the product molecule.
The sum of Gibbs free energy is related to the sum of reactant molecules and the product molecules which can affect the overall state of the equilibrium.
Gibbs energy or Gibbs free energy is the thermodynamic entity.
Change in Gibbs free energy is defined as the difference in change in enthalpy with the product of Temperature and change in entropy.
This can be mathematically represented as follows:
Where denotes the change in Gibbs energy, is the change in enthalpy T is the temperature and is the entropy.
Gibbs free energy can be greater than 0, less than 0, and equal to 0.
If Gibbs free energy is greater than 0 the reaction is a non-spontaneous reaction.
If Gibbs free energy is less than 0 the reaction is a spontaneous reaction.
If Gibbs free energy is equal to 0 the reaction is in equilibrium.
Spontaneous reactions are those reactions that do not require any external or internal force to proceed with the reaction whereas non-spontaneous will require some external efforts to proceed with the reaction.