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Elevation in Boiling Point

12.2 g of ben...

Question

12.2 g of benzoic acid (Mw = 122) in 100 g water has elevation in boiling point of $0.27. K_{b} = 0.54 K k g m o l^{- 1}$ . If there is 100% polymerization, the number of molecules of benzoic acid in associated state is

A

2

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B

1

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C

3

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D

4

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Solution

The correct option is A 2
$Δ T_{b} = i K_{b} m 0.27 = i \times 0.54 \times \frac{12.2}{122} \times \frac{1000}{100}$
or i = 0.5
Therefore, benzene associated as dimer, i.e., 2.

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