A good short cut to remember. Just convert using the "chemical factor." That isn't taught in many schools now (perhaps even none) but it's just the ratio of the molar masses. It will convert grams to grams or moles to moles. Note I multiplied by 2 and 3 to keep the Fe atoms equal. I can show you the long way if you want to see it.
0.785 mol Fe2O3 x (2*molar mass Fe3O4/3*molar mass Fe2O3) = ?
How many moles of Fe3O4 are required to supply enough iron to prepare 0.785 mol Fe2O3?
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