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Benzoic acid molecules undergo dimerisation in benzene. 2.44 g of benzoic acid when dissolved in 30 g of benzene caused depression in freezing point of 2 K. What is the percentage of association of it ? (Given K _f ( C ₆ H ₆ )=5 ~K ~kg ~mol ⁻¹ ; molar mass of benzoic acid =122 ~g ~mol ⁻¹ )

Options

  1. A80
  2. B70
  3. C60
  4. D90

Correct answer

A. 80

Step-by-step solution

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