The observed osmotic pressure of a solution o | vedclass

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(B) In benzene,benzoic acid molecules undergo association to form dimers due to intermolecular hydrogen bonding. This association reduces the total nu

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Benzoic acid molecules are associated in benzene

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(B) In benzene,benzoic acid molecules undergo association to form dimers due to intermolecular hydrogen bonding. This association reduces the total number of particles in the solution. Since osmotic pressure is a colligative property,it depends on the number of solute particles. As the number of particles decreases due to association,the observed osmotic pressure becomes less than the expected value. The structure of the dimer is as follows: (Image shows two benzoic acid molecules linked by two hydrogen bonds between the carboxyl groups).

The observed osmotic pressure of a solution of benzoic acid in benzene is less than its expected value because:

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