Question

when 50 g of H2S reacts with 50 g of O2, how much SO2 will it produce?

Answer 1

This is a limiting reagent problem. I know that because BOTH reactants are given. The scheme for solving these problems is to work a simple stoichiometry problem twice, once with one reactant and a second time with the other reactant. You will obtain two answers for the moles of the product, the correct answer in limiting reagent problems is ALWAYS the smaller one. Here is a worked example of a simple stoichiometry problem. Just follow the steps. Post your work if you get stuck.
http://www.jiskha.com/science/chemistry/stoichiometry.html