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Which carbon are u talking about? Carbon in coke is first oxidised to form carbon dioxide - C(s) + O2(g) -> CO2(g). Limestone is decomposed by heat to form calcium oxide and carbon dioxide. CaCO3 -> CaO(s) + CO2(g). The carbon dioxide produced in the two reactions are reduced by carbon in coke to form carbon monoxide. CO2(g) + C(s) -> 2CO(g). The carbon monoxide then reacts with iron (III) oxide in haematite to form iron and carbon dioxide. Fe2O3(s) + 3CO(g) -> 2Fe(l) + 3CO2(g). If ur referring to this last reaction above, 520grams of iron (III) oxide react with 210grams of carbon dioxide. Mol. of Fe203 reacted -> (520/104) = 5mol. Mol of carbon dioxide reacted -> 5 X 3 = 15. Mass of carbon dioxide reacted -> 15 X 14 = 210g

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