Molar gas volume

A student reacts excess magnesium with 50 cm³ of 1.0 mol/dm³ hydrochloric acid. The reaction is: $\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2$. What is the maximum volume of hydrogen gas formed at room temperature and pressure? (1 mol of gas occupies 24 dm³ at r.t.p.)