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

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less than 94

134.2

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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