3. Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous
hydrochloric acid to metallic zinc.
Zn(s) + 2 HCl(aq) → ZnCl₂(aq) + H₂(g)
Typically, the hydrogen gas is bubbled through water for collection and becomes saturated with water
vapor. Suppose 465 mL of hydrogen gas is collected at 42°C and has a total pressure of 1.056 atm by this
process (at this temperature the vapor pressure of water is 32 torr).
How many grams of hydrogen were produced in the reaction?
