Applications: The Breathalyzer

3 mL reference

8.5 x 10-4 M Cr2O72-(aq)

3 C2H5OH(g) + 2 Cr2O72-(aq) + 16 H+(aq)

3 C2H4O2(aq) + 4 Cr3+(aq) + 11 H2O(l)

If 4.0 L of breath reduces the Cr2O72- concentration to 8.0 x 10-4 M, what is the blood alcohol concentration (BAC) in g alcohol/100 mL blood?

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alcohol in 2100 mL breath = alcohol in 1 mL blood

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