If you have iron(II) oxide(s) + oxygen(g) --- Iron(III) oxide(s), Would the answer be FeO3 + O2 --- FeO3 for a skeleton equation?

Question

If you have iron(II) oxide(s) + oxygen(g) ---> Iron(III) oxide(s), Would the answer be FeO3 + O2 ---> FeO3 for a skeleton equation?

DrBob222 · Answer

not quite.

FeO + O2 ==> Fe2O3

For iron(II) oxide. you're told Fe is +2 and you know O is -2; therefore, the formula must be FeO

For iron(III) oxide, iron is +3 and O is -2; therefore the formula is Fe2O3.