---
title: "The standard Gibbs free energy of formation, \\(\\Delta G^\\circ_f\\), is defined as the change in Gibbs free energy when \\(1\\text{ mol}\\) of a substance in its standard state is formed from its constituent elements in their standard states at \\(298\\text{ K}\\) and \\(1\\text{ atm}\\). Which of the following balanced chemical equations represents the process for which \\(\\Delta G^\\circ_{\\text{rxn}} = \\Delta G^\\circ_f\\) for liquid ethanol, \\(\\text{C}_2\\text{H}_5\\text{OH}(l)\\)?"
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url: "https://nerd-notes.com/ubq/120327/"
date_modified: "2026-08-23T04:23:09+00:00"
---

# The standard Gibbs free energy of formation, \(\Delta G^\circ_f\), is defined as the change in Gibbs free energy when \(1\text{ mol}\) of a substance in its standard state is formed from its constituent elements in their standard states at \(298\text{ K}\) and \(1\text{ atm}\). Which of the following balanced chemical equations represents the process for which \(\Delta G^\circ_{\text{rxn}} = \Delta G^\circ_f\) for liquid ethanol, \(\text{C}_2\text{H}_5\text{OH}(l)\)?

The standard Gibbs free energy of formation, \(\Delta G^\circ_f\), is defined as the change in Gibbs free energy when \(1\text{ mol}\) of a substance in its standard state is formed from its constituent elements in their standard states at \(298\text{ K}\) and \(1\text{ atm}\). Which of the following balanced chemical equations represents the process for which \(\Delta G^\circ_{\text{rxn}} = \Delta G^\circ_f\) for liquid ethanol, \(\text{C}_2\text{H}_5\text{OH}(l)\)?

- **A.** \(4\text{ C}(s,\text{ graphite}) + 6\text{ H}_2(g) + \text{O}_2(g) \rightarrow 2\text{ C}_2\text{H}_5\text{OH}(l)\)
- **B.** \(2\text{ C}(s,\text{ graphite}) + 3\text{ H}_2(g) + \dfrac{1}{2}\text{ O}_2(g) \rightarrow \text{C}_2\text{H}_5\text{OH}(l)\)
- **C.** \(2\text{ C}(g) + 6\text{ H}(g) + \text{O}(g) \rightarrow \text{C}_2\text{H}_5\text{OH}(l)\)
- **D.** \(\text{C}_2\text{H}_4(g) + \text{H}_2\text{O}(l) \rightarrow \text{C}_2\text{H}_5\text{OH}(l)\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/120327/*