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title: "A student completely combusts a \\(0.900 \\text{ g}\\) sample of a pure organic compound containing only \\(\\text{C}\\), \\(\\text{H}\\), and \\(\\text{O}\\) in an excess of pure \\(\\text{O}_2\\text{(g)}\\). The reaction produces \\(1.32 \\text{ g}\\) of \\(\\text{CO}_2\\text{(g)}\\) and \\(0.540 \\text{ g}\\) of \\(\\text{H}_2\\text{O(g)}\\), which are collected quantitatively. Based on these data, what is the percent by mass of carbon in the original compound?"
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url: "https://nerd-notes.com/ubq/119570/"
date_modified: "2026-08-21T06:53:52+00:00"
---

# A student completely combusts a \(0.900 \text{ g}\) sample of a pure organic compound containing only \(\text{C}\), \(\text{H}\), and \(\text{O}\) in an excess of pure \(\text{O}_2\text{(g)}\). The reaction produces \(1.32 \text{ g}\) of \(\text{CO}_2\text{(g)}\) and \(0.540 \text{ g}\) of \(\text{H}_2\text{O(g)}\), which are collected quantitatively. Based on these data, what is the percent by mass of carbon in the original compound?

A student completely combusts a \(0.900 \text{ g}\) sample of a pure organic compound containing only \(\text{C}\), \(\text{H}\), and \(\text{O}\) in an excess of pure \(\text{O}_2\text{(g)}\). The reaction produces \(1.32 \text{ g}\) of \(\text{CO}_2\text{(g)}\) and \(0.540 \text{ g}\) of \(\text{H}_2\text{O(g)}\), which are collected quantitatively. Based on these data, what is the percent by mass of carbon in the original compound?

- **A.** \(27.3\%\)
- **B.** \(40.0\%\)
- **C.** \(53.3\%\)
- **D.** \(85.7\%\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119570/*