Question

On dissolving 0.4gm of urea in 100gm water the depression in freezing was found to be 0.124°C calculate the molecular mass of urea(K for water=1.86Kgmol!)​

Answer 1

Explanation:

A solution containing 0.85 g of ZnCl

2

in 125.0 g of water freezes at −0.23

o

C. The apparent degree of dissociation of the salt is :

( k

f

for water=1.86 K kg mol

−1

, atomic mass; Zn=65.3 and Cl=35.5)