An initial reaction mixture contains 9.42 g of Fe and 8.50 g of S. The following reaction occurs: Fe(s) + S(s) → FeS(s) a) Calculate the theoretical yield of FeS. b) How much of the excess reactant remains unreacted?

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".