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OpenStudy (anonymous):

Hydrogen gas can be readily prepared by reacting magnesium metal with hydrochloric acid: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) A sample of magnesium metal was decomposed in hydrochloric acid and the hydrogen gas was collected over water. The volume of gas collected is 0.342 L at 21oC and a total pressure of 748 torr.How many grams of hydrochloric acid were decomposed? [Hint: the vapor pressure of water at 21 oC can be obtained online.]

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