Chapter 11, Problem 106APP

Hydrogen gas can be produced in the laboratory through the reaction of magnesium metal with hydrochloric acid. When 12.0 g of Mg reacts, what volume, in liters, of ${\text{H}}_{\text{2}}$ gas is produced at $\text{24 °C and 835 mmHg}$ ? (11.7, 11.8)
   $2\text{HCl}\left(aq\right)+\text{ Mg}\left(s\right)\to {\text{ H}}_{\text{2}}\left(g\right)+{\text{ MgCl}}_2\left(aq\right)$