A sample of impure magnesium was analyzed by allowing it 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 of 0.750 M HCl, 0.0125 mol HCl remained. Assuming the impurities do not react with the acid, what is the mass % Mg in the sample?