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Abnormal Colligative Properties

20. Acetic ac...

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20. Acetic acid dimerises to an extent of 30% in benzene. The observed molecular mass is

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Acetic acid undergoes dimerisation, when dissolved in benzene (as shown in figure)
Molecular mass of acetic acid is found to be

120

Which among the following relation is correct?

α

= degree of association,

d

= observed vapour density,

D

= Theoretical vapour density).

C H_{3} C O O H

is added in 250 g benzene. Acetic acid dimerises in benzene due to hydrogen bond.

K_{b}

of benzene is 2 K

k g m o l^{- 1}

. The boiling point has increased by 6.4 K. % dimerisation of acetic acid is :

Q. Acetic acid dimerises in vapour phase at

437 K

2 C H_{3} C O O H (g) ⇌ {(C H_{3} C O O H)}_{2} (g)

0.0519 g

of acetic acid was found to have

764.3 m m

437 K

in a container of

21.45 {c m}^{3}

. Calculate degree of dimerisation for acetic acid dimerisation.

When benzoic acid dissolve in benzene, the observed molecular mass is:

In a certain solvent phenol dimerises to the extent of 60%. Its observed molecular mass in the solvent would be (M.M Phenol = 94)

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