Question

how many grams of hydrogen are produced when 1gram of aluminum is reacted?

Answer 1

Pick any acid to react with Al; for example, HCl
6HCl + 2Al ==> 2AlCl3 + 3H2.

Here is an example I posted for simple stoichiometry problems.
http://www.jiskha.com/science/chemistry/stoichiometry.html