Formulae — practice question

A sample of an iron oxide contains $50.4\,\text{g}$ of iron and $21.6\,\text{g}$ of oxygen. Determine the empirical formula of the iron oxide.

• A$\text{FeO}$
• B$\text{FeO}_3$
• C$\text{Fe}_2\text{O}_3$
• D$\text{Fe}_3\text{O}_2$