Phenol associates in benzene to a certain extent to form a dimer. A solution containing \[20\times {{10}^{-3}}\] kg of phenol in 1.0 kg-of benzene has its freezing point depressed by 0.69 K. Calculate the fraction of phenol that has dimerised. (\[{{K}_{f}}\]for benzene = 5.12 K kg \[mo{{l}^{-1}}\])

Phenol associates in benzene to a certain extent to form a dimer. A so

1.	Phenol associates in benzene to a certain extent to form a dimer. A solution containing \[20\times {{10}^{-3}}\] kg of phenol in 1.0 kg-of benzene has its freezing point depressed by 0.69 K. Calculate the fraction of phenol that has dimerised. (\[{{K}_{f}}\]for benzene = 5.12 K kg \[mo{{l}^{-1}}\])
A.	28.5%
B.	0.326
C.	73.3%
D.	0.82
Answer» D. 0.82

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Phenol associates in benzene to a certain extent to form a dimer. A solution containing \[20\times {{10}^{-3}}\] kg of phenol in 1.0 kg-of benzene has its freezing point depressed by 0.69 K. Calculate the fraction of phenol that has dimerised. (\[{{K}_{f}}\]for benzene = 5.12 K kg \[mo{{l}^{-1}}\])

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