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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).
Topic 1 - Stoichiometry. 1  Avogadroâs constant: The number of particles in 12g of 12C. 6.022 x 10^23. 2  Atomic mass: The mass of a single atom. 3  Chemical reaction: A reaction in which bonds in the reactants are broken and bonds in the products are formed resulting in an energy change between the reacting system and its surroundings.