Phenol associates in benzene to a certain extent to form a dimer. A solution containing \( 20 \t...

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Phenol associates in benzene to a certain extent to form a dimer. A solution containing \( 20 \times 10^{-3} \mathrm{~kg} \) phenol in \( 1 \mathrm{~kg} \) of benzene has its freezing point depressed by \( 0.69 \mathrm{~K} \). Calculate the fraction of phenol
\( P \) that has dimerised. \( \mathrm{K}_{\mathrm{f}} \) for benzene \( =5.12 \mathrm{~kg} \mathrm{~mol}^{-1} \mathrm{~K} \).

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