Solve this: W, Y 1000
o MY 45 x 60
1000
= 0.51 K kg mole-I
Try Yourself
7. The solution of 2.5g of a non-volatile substance in 100 g of benzene boiled at a
0.42 oc higher than the b.p. of pure benzene. Calculate mol. wt. of the substance.
(Kb of benzene is 2.67 K kg mole-I)
8. An aqueous solution Of glucose is made by dissolving 1 Og of glucose in 90g water at 303
If the V.P. of pure water at 303K be 32.8mmHg, what would be V.P. of the solution?
repression in freezing point: The property of decrease in freezing point when some non-volatile soiutea
isso/ved is called depression of freezing point. The depression in freezing point is represented as ST,.
eezing Point : Temperature at which the liquid and the solid forms of the solvent are in equilibrium ark
nce have same vapour pressure is called freezing point.
AT f = Kr•m
Kf is molal depression constant or cryoscopic constant substituting the value of molality in above
