What was the mass of fe3o4 in the sample of ore

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An ore contains Fe3O4 and no other iron. The iron in a 39.3-gram sample of the ore is all  converted by a series of chemical reactions to  Fe2O3. The mass of Fe2O3 is measured to be 10.6 g. What was the mass of Fe3O4 in the  sample of ore?
Answer in units of g

Reference no: EM13831650

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