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Police often use a Breathalyzer to determine the ethanol content in a person's blood. The test is actually a redox reaction. What element gets oxidized

Police often use a Breathalyzer to determine the ethanol content in a person's blood. The test is actually a redox reaction. What element gets oxidized and which gets reduced?

2 K_{2} C r_{2} O_{7} (a q) + 3 C_{2} H_{5} O H (g) + 8 H_{2} S O_{4} (a q) 2 C r_{2} (S O_{4})_{3} (a q) + 2 K_{2} S O_{4} (a q) +

3 C H_{3} \frac{C}{O} O H (a q) + 11 H_{2} O (1)

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