---
title: "An iron ore sample contains various iron oxides. A student analyzes three pure samples of iron oxides: \\(\\text{FeO}\\), \\(\\text{Fe}_2\\text{O}_3\\), and \\(\\text{Fe}_3\\text{O}_4\\). Which of the following lists the three oxides in order of greatest to least mass percent of iron (\\(\\text{Fe}\\))?"
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url: "https://nerd-notes.com/ubq/119296/"
date_modified: "2026-08-19T12:39:41+00:00"
---

# An iron ore sample contains various iron oxides. A student analyzes three pure samples of iron oxides: \(\text{FeO}\), \(\text{Fe}_2\text{O}_3\), and \(\text{Fe}_3\text{O}_4\). Which of the following lists the three oxides in order of greatest to least mass percent of iron (\(\text{Fe}\))?

An iron ore sample contains various iron oxides. A student analyzes three pure samples of iron oxides: \(\text{FeO}\), \(\text{Fe}_2\text{O}_3\), and \(\text{Fe}_3\text{O}_4\). Which of the following lists the three oxides in order of greatest to least mass percent of iron (\(\text{Fe}\))?

- **A.** \(\text{Fe}_2\text{O}_3 > \text{Fe}_3\text{O}_4 > \text{FeO}\)
- **B.** \(\text{FeO} > \text{Fe}_2\text{O}_3 > \text{Fe}_3\text{O}_4\)
- **C.** \(\text{FeO} > \text{Fe}_3\text{O}_4 > \text{Fe}_2\text{O}_3\)
- **D.** \(\text{Fe}_3\text{O}_4 > \text{Fe}_2\text{O}_3 > \text{FeO}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119296/*