Fe2O3 or iron(iii) oxide
Fe2o3
Assuming that you are asking about ferric oxide, its formula is Fe2O3
The molecular formula for Ferric Oxide is Fe2O3.
Ferric Carbonate = Iron (III) carbonate. Fe3+ + 3CO32- ==> Fe2(CO3)3
Oxygen is a chemical element and ferric oxide is a chemical compound: they are not "changes".
There are a number of compounds of iron wuth oxygen, iron(I) oxide, ferrous oxide, FeO iron (II,III) oxide ferric ferrous oxide, Fe3O4 iron(III) oxide, ferric oxide, Fe2O3.
feo3
There are a number of compounds of iron wuth oxygen, iron(I) oxide, ferrous oxide, FeO iron (II,III) oxide ferric ferrous oxide, Fe3O4 iron(III) oxide, ferric oxide, Fe2O3.
The ferric oxide is a chemical compound.
FeO for ferrous oxide, ( iron(II) oxide); Fe2O3 for ferric oxide, (iron(III) oxide) and Fe3O4 for ferrous ferric oxide, (iron (II,III) oxide)
Ferric oxide is a compound, composed of ions of iron ( Fe+3) and oxygen (O-2) bonded together after chemical reaction. Its formula is Fe2O3.
Fe3O4