The molar mass of acetic acid dissolved in benzene determined from the depression in freezing point is found to be

The molar mass of acetic acid dissolved in benzene determined from the depression in freezing point is found to be

A
$30 g {mol}^{- 1}$
B
$60 g {mol}^{- 1}$
C
$120 g {mol}^{- 1}$
D
$240 g {mol}^{- 1}$

Solution:

Acetic acid dimerizes in benzene. Its molar mass would be $2 \times 60 g {mol}^{- 1}$ , i.e, $120 g {mol}^{- 1}$

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