Well, I am in general chemistry 2 at a community college and I know I should probably be able to this problem but I am stuck.

"Write an equation for the production of Hydrogen (H2) from the reaction of zinc metal and hydrochlori

c acid. How many grams of zinc are required to make one liter of hydrogen gas at STP according to the reaction?"

I have figured out the equation:

Zn(s) + 2HCL(aq) --> H2(g) + ZnCl2(aq)

Now I've started doing the rest of the problem and I began by plugging in 1 Liter to PV=nRT and solving for the number of moles which gives me .045 mol Zn. Do I simply use mol ratio and then convert mol of Zn to mol of H2 and then to grams of H2, or am I way off? I think I am really messing something up but I am not sure. Any help is much appreciated