The amount of urea to be dissolved in `500` cc of water `(K_(f)=1.86)` to produce a depresssion of `0.186^(@)C` in the freezing point is :

Options

A. 0.3 g
B. 0.6 g
C. 6 g
D. 3 g

Answer

D

Explanation

`W_(2) =(Delta T_(f) xx M_(2) xx W_(2))/K_(f)`
`=(0.186 xx 60 xx 10^(-3) xx 0.5)/1.86kg`
= 3 g