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1$\begingroup$ Another similar question is : why does a strange compound like $\ce{Fe3O4}$ exist ? Why is Iron (plus one or two other metals) able to make an oxide containing the same element at two different oxidation states ? Why is it not the case for other metals like copper for example ? $\endgroup$– MauriceCommented Oct 15, 2023 at 17:07
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2$\begingroup$ An idea : did you compute the Gibbs enthalpy for either one of the two reactions? $\endgroup$– ButtonwoodCommented Oct 15, 2023 at 17:44
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1$\begingroup$ Five words: Steam is not oxidizing enough. $\endgroup$– Oscar LanziCommented Oct 15, 2023 at 18:01
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$\begingroup$ And chemistry.stackexchange.com/questions/73275/… $\endgroup$– Nilay GhoshCommented Oct 16, 2023 at 2:13
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$\begingroup$ @NilayGhosh It seems to me neither of linked answers addresses the reason why Fe2O3 is not formed. $\endgroup$– PoutnikCommented Oct 16, 2023 at 3:07
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