18.35 g of magnesium are added to 1.69 mol hydrochloric acid. Which is the excess reactant and by how many moles is it in excess?

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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".