Using the equation shown below, how many moles of Iron is needed to make 6 moles of Hydrogen? * 2 Fe+3 H 2 SO 4 Fe 2 (SO 4 ) 3 +3 H 2​

4 moles of Fe are needed to produced 6 moles of H₂

Explanation:

This is the whole reaction:

2Fe  + 3H₂SO₄  →  Fe₂(SO₄)₃ +  3H₂​

The equation determines:

2 mol of iron can react to 3 moles of sulfuric acid in order to produce 1 mol of iron (III) sulfate and 3 moles of hydrogen gas.

If we see the stoichiometry ratio is 2:3, from reactant to product but we need to know from product to reactant.

Then, we can solve it by an easy rule of three:

3 moles of H₂ can by produced by the reaction of 2 moles of Fe

Then 6 moles of H₂ may be produced by (6 . 2)/3 = 4 moles of Fe

4 moles of Fe are needed to produced 6 moles of H₂