---
title: "Glycerol, \\(\\text{C}_3\\text{H}_8\\text{O}_3\\text{(l)}\\), is an organic byproduct of biodiesel production that can be utilized as a liquid fuel. The table below provides standard enthalpies of formation, \\(\\Delta H^\\circ_f\\), at \\(298\\text{ K}\\).  | Substance | \\(\\Delta H^\\circ_f\\ (\\text{kJ/mol})\\) | | :— | :— | | \\(\\text{C}_3\\text{H}_8\\text{O}_3\\text{(l)}\\) | \\(-668\\) | | \\(\\text{CO}_2\\text{(g)}\\) | \\(-394\\) | | \\(\\text{H}_2\\text{O(l)}\\) | \\(-286\\) | | \\(\\text{H}_2\\text{O(g)}\\) | \\(-242\\) | | \\(\\text{O}_2\\text{(g)}\\) | \\(0\\) |  Based on the data in the table, what is the standard enthalpy of combustion, \\(\\Delta H^\\circ_{\\text{comb}}\\), for liquid glycerol at \\(298\\text{ K}\\)?"
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date_modified: "2026-08-23T05:02:11+00:00"
---

# Glycerol, \(\text{C}_3\text{H}_8\text{O}_3\text{(l)}\), is an organic byproduct of biodiesel production that can be utilized as a liquid fuel. The table below provides standard enthalpies of formation, \(\Delta H^\circ_f\), at \(298\text{ K}\).

| Substance | \(\Delta H^\circ_f\ (\text{kJ/mol})\) |
| :— | :— |
| \(\text{C}_3\text{H}_8\text{O}_3\text{(l)}\) | \(-668\) |
| \(\text{CO}_2\text{(g)}\) | \(-394\) |
| \(\text{H}_2\text{O(l)}\) | \(-286\) |
| \(\text{H}_2\text{O(g)}\) | \(-242\) |
| \(\text{O}_2\text{(g)}\) | \(0\) |

Based on the data in the table, what is the standard enthalpy of combustion, \(\Delta H^\circ_{\text{comb}}\), for liquid glycerol at \(298\text{ K}\)?

Glycerol, \(\text{C}_3\text{H}_8\text{O}_3\text{(l)}\), is an organic byproduct of biodiesel production that can be utilized as a liquid fuel. The table below provides standard enthalpies of formation, \(\Delta H^\circ_f\), at \(298\text{ K}\).

| Substance | \(\Delta H^\circ_f\ (\text{kJ/mol})\) |
| :--- | :--- |
| \(\text{C}_3\text{H}_8\text{O}_3\text{(l)}\) | \(-668\) |
| \(\text{CO}_2\text{(g)}\) | \(-394\) |
| \(\text{H}_2\text{O(l)}\) | \(-286\) |
| \(\text{H}_2\text{O(g)}\) | \(-242\) |
| \(\text{O}_2\text{(g)}\) | \(0\) |

Based on the data in the table, what is the standard enthalpy of combustion, \(\Delta H^\circ_{\text{comb}}\), for liquid glycerol at \(298\text{ K}\)?

- **A.** \(-2994\text{ kJ/mol}_{\text{rxn}}\
- **B.** \(-2802\text{ kJ/mol}_{\text{rxn}}\
- **C.** \(-2326\text{ kJ/mol}_{\text{rxn}}\
- **D.** \(-1658\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/121418/*