Solid magnesium reacts with hydrochloric acid according to the following equation: Mg(s) + 2 HCl(aq)  MgCl2(aq) + H2(g) If 25.0 mL of 0.15 M HCl are added to 0.0972 g Mg, determine the mass, in grams, of the leftover reactant

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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".