In the following balanced chemical equation, what does the subscript number after oxygen in iron(III) oxide mean?
2 F e 2 O 3 + 3 C → 4 F e + 3 C O 2
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3 atoms of oxygen in iron (III) oxide
3 molecules of iron (III) oxide
3 molecules of oxygen in iron (III) oxide
3 atoms of iron (III) oxide
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