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Benzoic acid forms dimers in benzene and shows a van't Hoff factor of 0.6. What percentage of the acid is associated?
A20%
B80%
C40%
D60%
Answer & Solution
Correct answer: B. 80%
For dimerisation i = 1 - x/2, so 0.6 = 1 - x/2 gives x = 0.8, or 80 percent association.
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