A chemical brearhalyzer test works because ethyl alco¬hol in the breath is oxidized by the dichromate ion

A chemical €œbrearhalyzer€ test works because ethyl alco¬hol in the breath is oxidized by the dichromate ion (orange) to form acetic acid and chromium(III) ion (green). The balanced reaction is

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.°C and 750. mm Hg, what was the mole percent alcohol of the breath?

Transcribed Image Text:

3HC2H O2iaą) 4Cr3a)1H2Ou)