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

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134.2

less than 94

150

answer is B.

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Detailed Solution

$α = \frac{1 - i}{1 - 1 / n}$

$0 .6 = \frac{1 - i}{1 - 1 / 2}$

$i = 0 .7$

$i = \frac{Normal molar mass}{abnormal molar mass}$

Abnormal molar mass = $\frac{94}{0.7} = 134.28$

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