A sample of impure magnesium was analyzed by allowingit to react with excess HCl solution: Mg(s)+ 2HCl(aq)→MgCl₂(aq) +H₂(g) After 1.32 g of the impure metal was treated with 0.100 L of0.750 MHCl, 0.0125 mol of HCl remained. Assuming the impu-rities do not react, what is the mass % of Mg in the sample?

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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".