For the equation below: Mg(s) + 2HCl(aq) ⟶ MgCl2(aq) + H2(g) (a) How many moles of hydrogen will be liberated from 177.6 mL of 4.94 M HCl reacting with an excess of magnesium? mol H2 (b) How many liters of hydrogen gas (H2) measured at 24∘C and 733 torr will be obtained? L H2