---
title: "A student is investigating the complete combustion of propane gas, \\(\\text{C}_3\\text{H}_8(g)\\). The balanced chemical equation for the combustion reaction is shown below.  \\[ \\text{C}_3\\text{H}_8(g) + 5\\,\\text{O}_2(g) \\rightarrow 3\\,\\text{CO}_2(g) + 4\\,\\text{H}_2\\text{O}(l) \\]  Standard enthalpies of formation, \\(\\Delta H_f^\\circ\\), measured at \\(298\\text{ K}\\) are provided in the table below.  | Substance | \\(\\Delta H_f^\\circ\\text{ (kJ/mol)}\\) | | :— | :— | | \\(\\text{C}_3\\text{H}_8(g)\\) | \\(-104\\) | | \\(\\text{O}_2(g)\\) | \\(0\\) | | \\(\\text{CO}_2(g)\\) | \\(-394\\) | | \\(\\text{H}_2\\text{O}(l)\\) | \\(-286\\) |  Based on the data in the table, what is the standard enthalpy of combustion, \\(\\Delta H_{\\text{rxn}}^\\circ\\), for the reaction?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/119679/"
date_modified: "2026-08-21T17:15:47+00:00"
---

# A student is investigating the complete combustion of propane gas, \(\text{C}_3\text{H}_8(g)\). The balanced chemical equation for the combustion reaction is shown below.

\[ \text{C}_3\text{H}_8(g) + 5\,\text{O}_2(g) \rightarrow 3\,\text{CO}_2(g) + 4\,\text{H}_2\text{O}(l) \]

Standard enthalpies of formation, \(\Delta H_f^\circ\), measured at \(298\text{ K}\) are provided in the table below.

| Substance | \(\Delta H_f^\circ\text{ (kJ/mol)}\) |
| :— | :— |
| \(\text{C}_3\text{H}_8(g)\) | \(-104\) |
| \(\text{O}_2(g)\) | \(0\) |
| \(\text{CO}_2(g)\) | \(-394\) |
| \(\text{H}_2\text{O}(l)\) | \(-286\) |

Based on the data in the table, what is the standard enthalpy of combustion, \(\Delta H_{\text{rxn}}^\circ\), for the reaction?

A student is investigating the complete combustion of propane gas, \(\text{C}_3\text{H}_8(g)\). The balanced chemical equation for the combustion reaction is shown below.

\[ \text{C}_3\text{H}_8(g) + 5\,\text{O}_2(g) \rightarrow 3\,\text{CO}_2(g) + 4\,\text{H}_2\text{O}(l) \]

Standard enthalpies of formation, \(\Delta H_f^\circ\), measured at \(298\text{ K}\) are provided in the table below.

| Substance | \(\Delta H_f^\circ\text{ (kJ/mol)}\) |
| :--- | :--- |
| \(\text{C}_3\text{H}_8(g)\) | \(-104\) |
| \(\text{O}_2(g)\) | \(0\) |
| \(\text{CO}_2(g)\) | \(-394\) |
| \(\text{H}_2\text{O}(l)\) | \(-286\) |

Based on the data in the table, what is the standard enthalpy of combustion, \(\Delta H_{\text{rxn}}^\circ\), for the reaction?

- **A.** \(-2430 \, \text{kJ/mol}_{\text{rxn}}\)
- **B.** \(-2326 \, \text{kJ/mol}_{\text{rxn}}\)
- **C.** \(-2222 \, \text{kJ/mol}_{\text{rxn}}\)
- **D.** \(-576 \, \text{kJ/mol}_{\text{rxn}}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119679/*