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OpenStudy (anonymous):
5. Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.7 g of Fe reacts completely with oxygen? 4Fe (s) + 3O2 (g) ---> Fe2O3 (s) can someone explain me how to do this ? i know the answer already. its 23.9
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