Gas calculations help please

How would you go about doing this question?

1.2g Mg reacts with excess sulphuric acid. Calculate the volume of Hydrogen produced at room temperature and pressure.

1. Write Balanced equation
so...Mg (s) + h2S04 (aq) ----> MgS04(aq) + H2(g)

1.2/24 = 0.05 moles

0.05 x 24 = 1.2dm cubed...is this correct?

Thanks!