Respuesta :

Answer:

3Fe(s)+2O2(g)---->Fe3O4

this way you will have 3irons on both sides and 4 oxygens.

I hope this helps

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[tex]\boxed{\pmb{\red{\sf{3Fe(s) + 2O_{2}(g)\dashrightarrow Fe_{3}O_{4}(s)}}}}[/tex]

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