Question

iron reacts with superheated steam to form hydrogen gas and the oxide fe3o4. calculate the number of moles of hydrogen produced by 10.0g of iron and enough steam. 3fe(s)+4h2o(g)-->fe3o4(s)+4h2(g)

Answer 1

This is a stoichiometry problem.
Step 1: Convert the mass of iron to moles
Step 2: Convert the moles of iron to moles of hydrogen using the coefficients of the balanced reaction.