Question

`75.2 g` of `C_(6)H_(5)OH` (phenol) is dissolved in a solvent of `K_(f) = 14`. If the depression in freezing point is `7K`, then find the percentage of phenol that dimerises.
A. `50%`
B. `75%`
C. `25%`
D. `99%`

Answer 1

Correct Answer - B
`2C_(6)H_(5)OH rArr (C_(6)H_(5)OH)_(2)`
`7=14xx0.8((2-alpha)/(2))^((C alpha)/(2))`
`alpha = 0.75=75%`