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Two grams of benzoic acid (C(6)H(5)COOH)...

Two grams of benzoic acid `(C_(6)H_(5)COOH)` dissolved in `25.0 g` of benzene shows a depression in freezing point equal to `1.62 K`. Molal depression constant for benzene is `4.9 K kg^(-1)"mol^-1`. What is the percentage association of acid if it forms dimer in solution?

A

`9.92%`

B

`99.2%`

C

`90.08%`

D

`0.8%`

Text Solution

Verified by Experts

The correct Answer is:
B
`alpha = (1-i)/(1-(1)/(n))`
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