AP Chemistry
4.9 Oxidation-Reduction (Redox) Reactions
4.7 Types of Chemical Reactions
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?
\[ 2\,\text{Cr}_2\text{O}_7^{2-}\text{(aq)} + 16\,\text{H}^+\text{(aq)} + 3\,\text{C}_2\text{H}_5\text{OH(aq)} \rightarrow 4\,\text{Cr}^{3+}\text{(aq)} + 3\,\text{CH}_3\text{COOH(aq)} + 11\,\text{H}_2\text{O(l)} \]
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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