Question

Which formula correctly represents the composition of iron (III) oxide?
(1) FeO3 (3) Fe3O(2) Fe2O3 (4) Fe3O2

Answer 1

Iron (III) oxide has a chemical formula of (2) Fe2O3.

Hope this helps~

Answer 2

2) Fe2O3 because Oxygen has has a negative 2 charge and Iron has a -3 charge so u need 2 iron and 3 oxygen