What is the mass of iron that could be obtained from 67.0 grams of iron(III) oxide?
So, if I smelt this quantity of ferric oxide I can get AT MOST 0.4 mol of iron metal, approx. 20 g of the stuff.
Of course, you will have to check the calculation yourself; I may have made a mistake.
In an iron foundry, these metal oxides are reduced on industrial scales. What do they use to reduce the iron from Fe(III) to Fe(O)?