stoichiometric

properly refers to the set of chemical and physical principles applied to determine the relationships between reactants and products in a chemical process. In stoichiometric calculations, it is the mass relationship existing between the chemical reactants and products, which are of the primary interest. As an adjective, "stoichiometric" is often taken to refer to the quantities of reactants and products as determined by the reaction equation for a specific chemical reaction, which produces no by-products.