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.)
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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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