1. Iron (III) sulfide reacts with hydrochloric acid according to the reaction.  FeS (s) + 2HCL (aq) ---> FeCl2 (s) + H2S (g)  A reaction mixture initially contrains 0.223 mol FeS and 0.652 mol HCl. Once the reaction is complete, what amount (in moles) of the excess reactant remains?

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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".