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3. What is the mass of iron contained in 100.0g of an iron ore which is 80.00% hematite, Fe2O3 ? (Iron ore is a rock

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3. What is the mass of iron contained in 100.0g of an iron ore which is 80.00% hematite, Fe2O3 ? (Iron ore is a rock which contains a mixture of hematite and other minerals). A sample of bismuth weighing 0.687g was converted to bismuth chloride by reacting it first with HNO3, and then with HCl, followed by careful evaporation to dryness. The mass of the bismuth chloride obtained was 1.032g. (a) What is the empirical formula of bismuth chloride

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