Test Academy | Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass. Fe2O3, Fe3O4, FeO, Feo3

Question

Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass.

Options :

Fe2O3
Fe3O4
FeO
Feo3

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