How many grams of iron II sulfide have to react with hydrochloric acid to generate 12 g of hydrogen sulfide?

FeS+2HCl-->FeCl2+H2S Moles of H2S produced equal to moles of FeS used. Moles of H2S=12\34=0.353mol Grams of Fes=0.353*88=31.05g