O goes frm zero to -2
Fe goes from zero to +2
but on the left, one has O2, so we need two Fe
2Fe(s)+O2+H2O >>>> 2Fe+2 + OH-
that balances charge, but mass has to be balanced...
2Fe + O2 + 2H2O>>>>2Fe+2(aq) + 4OH-
check that.
Balance redox reaction.
Fe(s) + O2(g) + H2O(l)-->Fe2+(aq) +OH-
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