Verified answer

Duh! Fe2O3

Of course it's NOT what roxmysox says. It's not FeO3.

Iron 3 Oxide Formula

Iron 111 Oxide

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RE:

Write the formula for the following: iron(III) oxide ?

It's Fe2O3

Iron has a charge of 3+

Oxygen has a charge of 2-

just swap the numbers and make them subscript

Fe2O3.

FeO3