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phenol associates in benzene to a certai...

phenol associates in benzene to a certain extent in dimerisation reaction. A solution containing 0.02 kg of phenol in 1.0 kg of benzene has its freezing point depressed 0.69 k. [`K_(f)(C_(6)H_(6)) =5.12 k kg"mol"^(-1)`]. The degree of association:

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Total=`1-alpha+(alpha/2)=1-(alpha/2)`
`i=(1-(alpha//2))/1=1-alpha/2`
`DeltaT_(f)=iK_(f)(W_(2)xx1000)/(Mx_(2) xx W_(1))`
`0.69=(i xx 5.12 xx 20 xx 10^(3))/ (94 xx 1.0 kg)`
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