Iron metal reacts with oxygen to produce iron(III)oxide.If you have 12.0 moles of iron for complete reaction,you need:

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The balanced chemical equation for the reaction between iron (Fe) and oxygen (O2) to produce iron(III) oxide (Fe2O3) is 4Fe + 3O2 → 2Fe2O3. For every 4 moles of Fe, 3 moles of O2 are needed, and 2 moles of Fe2O3 are produced. If you have 12.0 moles of Fe, you would need (12.0 moles Fe / 4 moles Fe) * 3 moles O2 = 9.0 moles of O2, and you would produce (12.0 moles Fe / 4 moles Fe) * 2 moles Fe2O3 = 6.0 moles of Fe2O3.

Iron Metal Reacts with Oxygen to Produce Iron(III)oxide