Hydrogen gas can be prepared by reaction of zinc metal with aqueous HCl:
Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
How many grams of zinc would you start with if you wanted to prepare 4.00L of H2 at 354mm Hg and 27.5*C?
Moles of H2 formed= PV/RT
THus moles of Zn=0.076 mol
Mass of Zn=0.076*65=4.95 g
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