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Read the following paragraph and answer ...

Read the following paragraph and answer the question given below:
Freezing point of benzene is 278.4K and heat of fusion of benzene is 10.042 KJ/mol. Acetic acid exists partly as dimer in benzene solution. The freezing point of 0.02 mol fraction of acetic acid in benzene is 277.4 K.
The molal cryoscopic constant of benzene in `K "molality"^(-1)` is

A

`4.0`

B

5.6

C

4.5

D

`5.0`

Text Solution

Verified by Experts

The correct Answer is:
D
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The freezing point of 0.02 mole fraction acetic acid in benzene is 277.4 K . Acetic acid exists partly as dimer. Calculate the equilibrium constant for dimerization. The freezing point of benzene is 278.4 K and the heat the fusion of benzene is 10.042 kJ mol^(-1) . Assume molarity and molality same.