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van't Hoff factor: dissociation and association
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so219
Ethanoic (acetic) acid dissolved in benzene exists as dimers through hydrogen bonding. If the acid is completely dimerised, the van't Hoff factor is
A
0.5
B
1
C
0.25
D
2
Answer: A
Two molecules combine to give one particle,
2
CH
X
3
COOH
⇌
(
CH
X
3
COOH
)
2
. For complete dimerisation the number of particles is halved, so
i
=
2
1
=
0.5
.
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