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Question:

Determine the empirical formula for iron oxide in this sample of ore?

Iron is obtained from the oxide in iron ore by heating with carbon in the form of coke. If a sample of the oxide, 10.78 g, is decomposed in this way, 8.378 g of iron is obtained. Determine the empirical formula for the iron oxide in this sample of the ore.(Hint: first determine the number of moles in iron and oxygen in this sample.)

Answer:

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according to info, in 10.78g iron oxide there is 8.378g iron and therefore (10.78-8.378)g O (which is 2.402g) moles iron 8.378/55.85 (or 56, if rounded further) 0.15 moles oxygen 2.402/16 0.150125 they are both about the same, so ratio of oxy to iron is 1:1 so empirical formula is FeO !!
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