---
title: "A student investigates the reduction of iron(III) oxide by carbon monoxide gas, as represented by the following balanced chemical equation:  \\(\\text{Fe}_2\\text{O}_3\\text{(s)} + 3\\,\\text{CO(g)} \\rightarrow 2\\,\\text{Fe(s)} + 3\\,\\text{CO}_2\\text{(g)}\\)  The student collects the thermodynamic data shown in the table below.  | Substance | \\(\\Delta H^\\circ_f\\text{ (kJ/mol)}\\) | |—|—| | \\(\\text{Fe}_2\\text{O}_3\\text{(s)}\\) | \\(-824\\) | | \\(\\text{CO(g)}\\) | \\(-110\\) | | \\(\\text{Fe(s)}\\) | \\(0\\) | | \\(\\text{CO}_2\\text{(g)}\\) | \\(-394\\) |  Based on the data in the table, what is the standard enthalpy change, \\(\\Delta H^\\circ_{rxn}\\), for the reaction?"
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url: "https://nerd-notes.com/ubq/119268/"
date_modified: "2026-08-19T12:39:35+00:00"
---

# A student investigates the reduction of iron(III) oxide by carbon monoxide gas, as represented by the following balanced chemical equation:

\(\text{Fe}_2\text{O}_3\text{(s)} + 3\,\text{CO(g)} \rightarrow 2\,\text{Fe(s)} + 3\,\text{CO}_2\text{(g)}\)

The student collects the thermodynamic data shown in the table below.

| Substance | \(\Delta H^\circ_f\text{ (kJ/mol)}\) |
|—|—|
| \(\text{Fe}_2\text{O}_3\text{(s)}\) | \(-824\) |
| \(\text{CO(g)}\) | \(-110\) |
| \(\text{Fe(s)}\) | \(0\) |
| \(\text{CO}_2\text{(g)}\) | \(-394\) |

Based on the data in the table, what is the standard enthalpy change, \(\Delta H^\circ_{rxn}\), for the reaction?

A student investigates the reduction of iron(III) oxide by carbon monoxide gas, as represented by the following balanced chemical equation:

\(\text{Fe}_2\text{O}_3\text{(s)} + 3\,\text{CO(g)} \rightarrow 2\,\text{Fe(s)} + 3\,\text{CO}_2\text{(g)}\)

The student collects the thermodynamic data shown in the table below.

| Substance | \(\Delta H^\circ_f\text{ (kJ/mol)}\) |
|---|---|
| \(\text{Fe}_2\text{O}_3\text{(s)}\) | \(-824\) |
| \(\text{CO(g)}\) | \(-110\) |
| \(\text{Fe(s)}\) | \(0\) |
| \(\text{CO}_2\text{(g)}\) | \(-394\) |

Based on the data in the table, what is the standard enthalpy change, \(\Delta H^\circ_{rxn}\), for the reaction?

- **A.** \(-28 \text{ kJ/mol}\)
- **B.** \(+28 \text{ kJ/mol}\)
- **C.** \(+540 \text{ kJ/mol}\)
- **D.** \(+2336 \text{ kJ/mol}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119268/*