The reaction shown below produces at least one gaseous product in aqueous media. The resulting gas is usually collected for future use/analyses. (The vapor pressure of water at 20.21 ∘C is 2.369 kPa.) LiH(s) + H2O(l) ⟶ LiOH(aq) + H2(g)

A sample of LiH is completely reacted to produce H2 gas at a total external pressure of 741.2 mmHg at 20.21 ∘C. The volume of gas collected was 1073.09 mL. What mass of LiH was used to produce the gas?