What is the weight of iron contained in 100g of an iron ore which is 80.00 % hematite, Fe2O3? (iron ore is a rock which contains a misture of hematite and other minerals)
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Atomic weights: Fe 56, O 16 1 mol Fe2O3 contains 2 * 56 112 g Fe and 16 * 3 48 g O % of Fe in Fe2O3 100 * 112/(112+48) 70 100 g iron ore contains 80.00 g Fe2O3 80.00 g Fe2O3 contains 80.00 * 70/100 56 g (Answer)
