3.20 g of magnesium reacts with hydrochloric acid, generating
hydrogen gas according to the reaction below. The hydrogen
gas is collected over water.
Mg(s) + 2HCl(aq) MgCl2(aq) + H2(8)
If 2.97 L of hydrogen gas is collected at 760.0 mmHg and
20°C, what was the percent yield of the reaction?