It is a molecule.
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Ferric oxide is a compound made up of iron and oxygen atoms. It is not an atom or a molecule on its own, but rather a combination of atoms.
Ferric oxide, also known as iron(III) oxide, is typically red or rust-colored.
One molecule of iron oxide consists of one iron atom and one oxygen atom. Therefore, the total number of atoms in one molecule of iron oxide is two.
The formula for oxygen is O2, indicating that oxygen atoms exist as a diatomic molecule. The formula for iron is Fe, representing the elemental form of iron.
Ferric oxide is commonly referred to as rust.
When aluminum chloride is added to a ferric oxide solution, a chemical reaction occurs where the aluminum displaces the iron in the ferric oxide, forming aluminum oxide and iron chloride. This results in a color change and the formation of a precipitate of aluminum hydroxide.