An Iron Ore, Magnetite, Contains Only Iron and Oxygen

question 11

Multiple Choice

An iron ore, magnetite, contains only iron and oxygen. In refining 100.0 g of the ore, 72.35 g of iron are obtained. What is the empirical formula of the ore?

• A)Fe₂O₃
• B)FeO₂
• C)Fe₂O₅
• D)Fe₃O₄
• E)FeO

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