So we can see that if we know what the gives free energy value is of some particular reaction, we know whether or not that reaction is actually spontaneous. Now, another important fact that you have to know about this quantity gives free energy is gives free energy only depends on the energy, the free energy value of the product and the free energy value of the reactants. So if we know what the free energy of the product is and the free energy of the reactants, all we have to do is subtract the two to find that gives free energy. So the pathway that we take when we go from the reactant to the products does not actually determine, does not change what the Gibbs free energy is. It doesn't matter if we take pathway one, two or three when we go from the reactants to products, gives free energy will not actually change. So if we, for example, compare a reaction that has an enzyme and that same reaction that is uncatalyzed does not have an enzyme, the Gibbs free energy in those two reactions will be exactly the same.