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Breathalyzers determine the alcohol content in a person's breath by the following (unbalanced) redox reaction:
C2H5OH + Cr2O72? ? CH3CO2H + Cr3+ (acidic solution)
If analysis of a breath sample generates 6.80 x 10-4 M Cr3+ ions in 35.0 mL, how many mg of alcohol did it contain?

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