Zinc metal reacts with excess hydrochloric acid to produce hydrogen gas:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
In one experiment, a sample of Zn reacts, and the gas produced is collected by water displacement. The gas sample has a temperature of 22.00 °C, a volume of 645.0 mL, and a pressure of 742.0 mm Hg. Calculate the amount (in moles) of hydrogen gas produced in the reaction. The vapor pressure of water is 19.83 mm Hg at 22.00 °C.
_______mol