A sample of iron(III) oxide, Fe₂O₃, is heated in a stream of excess hydrogen gas, H₂ to produce 5.6 g of iron metal according to the following equation:
Fe₂O₃(g) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
Calculate the mass of the iron (III) oxide sample

extra question: why does it have H₂O in the product for the chemical equation?

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