Question

What minimum volume of 3.0 M H2SO4 is required to produced 13 L of H2 at STP?

Reaction formula:
2Al(s) + 3H2SO4(aq) --> Al2(SO4)3(aq) + 3H2 (g)

Answer 1

Here is a worked example of a stoichiometry problem and it will work all of your stoichiometry problems. Remember 13LH2/molar mass H2 = moles H2 and moles H2SO4 = M x L.
http://www.jiskha.com/science/chemistry/stoichiometry.html