A solution of `0.450g` of urea (mol.wt 60) in `22.5g` of water showed `0.170^(@)C` of elevation in boiling point, the molal elevation constant of water:

Options

A. `0.51`
B. `0.95`
C. `0.25`
D. `2.25`

Answer

A

Explanation

`0.17 = ((0.45)/(60))/(22.9) xx 1000 xx K_(b)`
`(0.17)/(0.33) = K_(b), K_(b) = 0.51`