I'm wondering when the metal that is being reduced reacts, does it always end up by itself? Example: Carbon monoxide gas is passed over hot iron (III) oxide. (II) (III) (IV) (II) CO + Fe2O3 ---> CO2 + Fe When i first attempted this problem I got FeO instead of just Fe. So I am wondering will the reduce metal always end up just being an element like in this problem? Or is oxygen not listed in the answer because it is a spectator?