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12 mol gaseous mixture of an alkane and ...

12 mol gaseous mixture of an alkane and an alkene (containing same number of carbon atoms) require exactly 285 ml of air (containing 20% v/v `O_(2)` and rest `N_(2)` ) for complete combustion at 200K . After combustion when gaseous mixture is passes through KOH solution it shows volume contraction of 36 ml.
Mole fraction of `CO_(2)` in final gaseous sample:

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