---
title: "\\[\\text{C}_2\\text{H}_5\\text{OH}(l) + 3\\,\\text{O}_2(g) \\rightarrow 2\\,\\text{CO}_2(g) + 3\\,\\text{H}_2\\text{O}(g)\\]  A \\(13.8\\text{ g}\\) sample of ethanol, \\(\\text{C}_2\\text{H}_5\\text{OH}(l)\\) (molar mass \\(46.0\\text{ g/mol}\\)), is mixed with \\(19.2\\text{ g}\\) of \\(\\text{O}_2(g)\\) (molar mass \\(32.0\\text{ g/mol}\\)) in a sealed container. The mixture is ignited and the combustion reaction represented above proceeds to completion. Assuming no other reactions occur, what is the mass of the excess reactant remaining in the container after the reaction?"
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url: "https://nerd-notes.com/ubq/119719/"
date_modified: "2026-08-21T08:12:08+00:00"
---

# \[\text{C}_2\text{H}_5\text{OH}(l) + 3\,\text{O}_2(g) \rightarrow 2\,\text{CO}_2(g) + 3\,\text{H}_2\text{O}(g)\]

A \(13.8\text{ g}\) sample of ethanol, \(\text{C}_2\text{H}_5\text{OH}(l)\) (molar mass \(46.0\text{ g/mol}\)), is mixed with \(19.2\text{ g}\) of \(\text{O}_2(g)\) (molar mass \(32.0\text{ g/mol}\)) in a sealed container. The mixture is ignited and the combustion reaction represented above proceeds to completion. Assuming no other reactions occur, what is the mass of the excess reactant remaining in the container after the reaction?

\[\text{C}_2\text{H}_5\text{OH}(l) + 3\,\text{O}_2(g) \rightarrow 2\,\text{CO}_2(g) + 3\,\text{H}_2\text{O}(g)\]

A \(13.8\text{ g}\) sample of ethanol, \(\text{C}_2\text{H}_5\text{OH}(l)\) (molar mass \(46.0\text{ g/mol}\)), is mixed with \(19.2\text{ g}\) of \(\text{O}_2(g)\) (molar mass \(32.0\text{ g/mol}\)) in a sealed container. The mixture is ignited and the combustion reaction represented above proceeds to completion. Assuming no other reactions occur, what is the mass of the excess reactant remaining in the container after the reaction?

- **A.** \(3.20\text{ g}\)
- **B.** \(4.60\text{ g}\)
- **C.** \(9.20\text{ g}\)
- **D.** \(17.6\text{ g}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119719/*