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7) 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 7.70 x 10-4 M Cr3+ ions in 20.0 mL, how many mg of alcohol did it contain?

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7) 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 7.70 x 10-4 M Cr3+ ions in 20.0 mL, how many mg of alcohol did it contain?

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