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title: "An analytical method to measure the concentration of ethanol in a sample utilizes an acidified potassium dichromate solution according to the balanced net ionic equation below:  \\[ 2\\,\\text{Cr}_2\\text{O}_7^{2-}\\text{(aq)} + 16\\,\\text{H}^+\\text{(aq)} + 3\\,\\text{C}_2\\text{H}_5\\text{OH(aq)} \\rightarrow 4\\,\\text{Cr}^{3+}\\text{(aq)} + 3\\,\\text{CH}_3\\text{COOH(aq)} + 11\\,\\text{H}_2\\text{O(l)} \\]  Which of the following correctly identifies the reducing agent and the total number of moles of electrons transferred for the reaction as written?"
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date_modified: "2026-09-28T12:01:53+00:00"
---

# An analytical method to measure the concentration of ethanol in a sample utilizes an acidified potassium dichromate solution according to the balanced net ionic equation below:

\[ 2\,\text{Cr}_2\text{O}_7^{2-}\text{(aq)} + 16\,\text{H}^+\text{(aq)} + 3\,\text{C}_2\text{H}_5\text{OH(aq)} \rightarrow 4\,\text{Cr}^{3+}\text{(aq)} + 3\,\text{CH}_3\text{COOH(aq)} + 11\,\text{H}_2\text{O(l)} \]

Which of the following correctly identifies the reducing agent and the total number of moles of electrons transferred for the reaction as written?

An analytical method to measure the concentration of ethanol in a sample utilizes an acidified potassium dichromate solution according to the balanced net ionic equation below:

\[ 2\,\text{Cr}_2\text{O}_7^{2-}\text{(aq)} + 16\,\text{H}^+\text{(aq)} + 3\,\text{C}_2\text{H}_5\text{OH(aq)} \rightarrow 4\,\text{Cr}^{3+}\text{(aq)} + 3\,\text{CH}_3\text{COOH(aq)} + 11\,\text{H}_2\text{O(l)} \]

Which of the following correctly identifies the reducing agent and the total number of moles of electrons transferred for the reaction as written?

- **A.** Reducing agent: \(\text{Cr}_2\text{O}_7^{2-}\text{(aq)}\) ; Moles of \(e^-\) transferred: \(6\text{ mol}\)
- **B.** Reducing agent: \(\text{Cr}_2\text{O}_7^{2-}\text{(aq)}\) ; Moles of \(e^-\) transferred: \(12\text{ mol}\)
- **C.** Reducing agent: \(\text{C}_2\text{H}_5\text{OH(aq)}\) ; Moles of \(e^-\) transferred: \(6\text{ mol}\)
- **D.** Reducing agent: \(\text{C}_2\text{H}_5\text{OH(aq)}\) ; Moles of \(e^-\) transferred: \(12\text{ mol}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/123643/*