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When 20g of naphthoic acid (C(11)H(8)O(2...

When `20g` of naphthoic acid `(C_(11)H_(8)O_(2))` is dissolved in `50g` of benzene `(K_(f) = 1.72 K kg mol^(-1))`, a freezing point depression of `2K` is observed of `2K` is observed. The van,t Hoff factor `(i)` is:

A

`0.5`

B

`1.0`

C

`2.0`

D

`3.0`

Text Solution

Verified by Experts

The correct Answer is:
A
`Delta T_(f) = K_(f) xx "molality" xx i`
`2 = 1.72 xx (20)/(172) xx (1000)/(50) xx i`
`i = 0.5`
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