Concept explainers
Interpretation: The mole percent of alcohol analyzed by the ‘breath analyzer’ wherein 4.2 mg of potassium dichromate is oxidized from breath of 0.500 L at 30(C and 750 mm Hg needs to be determined.
Concept introduction:
Number of moles of a substance is related to mass and molar mass as follows:
Here, m is mass and M is molar mass.
Answer to Problem 155AE
The mole percent of alcohol analyzed by breath analyzer is 0.11%
Explanation of Solution
The reaction of ethyl alcohol oxidized by dichromate ion giving acetic acid and chromium (III) is as follows:
But it is known that,
Given Mass of
Observing equation (i), it can be seen that 3 moles of ethyl alcohol is oxidized by 2 moles of potassium dichromate. This will help to calculate the number of moles of alcohol oxidized as given below
From
Where V = 0.50 L
P = 750 mm Hg = 0.98 atm
R = 0.082 L.atm /mol K
T = 30 + 273 K= 303 K
The mole percent of alcohol analyzed by the ‘breath analyzer’ is 0.11% when 4.2mg of Potassium dichromate is oxidized from breath of 0.500L at 30(C and 750mm Hg.
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Chapter 21 Solutions
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