ABSTRACT
Stoichiometry allows us to calculate the mass of any chemical species (reactant or product) in the reacting system in relation to the other species present. It is founded in two fundamental laws of chemistry, namely the Law of Definite Proportions and the Law of Multiple Proportions, along with the Law of Conservation of Mass. Unlike in liquids and solids, where the volume is practically unchanged during the course of a reaction, in reacting systems consisting of gases, the volume is related to the total number of moles, total pressure, and temperature of the system by the equation of state.
