Solved: A chemical breathalyzer test works because ethyl
Chapter 21, Problem 21.156(choose chapter or problem)
A chemical breathalyzer test works because ethyl alcohol in the breath is oxidized by the dichromate ion (orange) to form acetic acid and chromium(III) ion (green). The balanced reaction is 3C2H5OH(aq) 1 2Cr2O7 22 (aq) 1 2H1(aq) 888n 3HC2H3O2(aq) 1 4Cr31(aq) 1 11H2O(l) You analyze a breathalyzer test in which 4.2 mg of K2Cr2O7 was reduced. Assuming the volume of the breath was 0.500 L at 30.8C and 750. mm Hg, what was the mole percent alcohol of the breath?
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