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1. stoichiometry - (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers).
In stoichiometric terms, the ratio of products to reactants (in mass) are the same due to to conservation of mass (372 grams for each side using the number of moles in the equation). So efficiency is moot there. Note that the heat released in the reaction comes from bond energies, as energy is also conserved.