The chemical formula of rust is Fe₂O₃. Which of the following is the correct systematic name for this compound?

Question

Quizplus · Accepted Answer

The systematic name for rust is iron(III) oxide, which indicates that the compound contains iron in its +3 oxidation state (hence the III) and oxygen. Choice A, iron oxide, is not specific enough regarding oxidation state. Choice B, iron(II) oxide, does not match the formula of rust. Choice D, diiron trioxide, suggests that there are only two iron atoms in the compound, which is not the case for rust.

The Chemical Formula of Rust Is Fe2O3

The Chemical Formula of Rust Is Fe₂O₃