ABSTRACT
This chapter explores the Gibbs energy change accompanying a chemical reaction and we establish the conditions of its equilibrium. The study is carried out by systematically considering the chemical potentials of the reactants and products. The chemical potential, indeed, is the pivotal quantity which commands the evolution of a chemical reaction. Evidently, the chemical potentials of the substances are different in the final states from those they had in the initial states since the composition of the system has changed owing to the studied process. Moreover, there may exist new products in the system with their own chemical potentials owing to the occurrence of the studied chemical reaction, as some reactants may have completely disappeared for the same reason.
