Q.

Phenol (mol.wt.94) dimerised to 60% in a solvent, the observed molar mass of phenol will be

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a

less than 94

b

134.2

c

94

d

150

answer is B.

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Detailed Solution

α=1−i1−1/n0.6=1−i1−1/2i=0.7i=Normal  molar massabnormal  molar massAbnormal molar mass = 940.7=134.28
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Phenol (mol.wt.94) dimerised to 60% in a solvent, the observed molar mass of phenol will be