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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 the 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 the 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 (2).

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Q. 12.2 g of benzoic acid (Mw = 122) in 100 g water has elevation in boiling point of

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