Question

(vi)
Find the mass of sucrose (Molecular Mass=342)-required to be
dissolved per 600cmº solution to prepare a semi-molar solution.​

Answer 1

Answer:

DepressioninFreezingpointΔT

f = M 1 ×W 2

W 1 ×K f ×1000

whereW 1 =Weight of Solute

W 2 =Weight of solvent

M 1 =Molar mass of solute

K f =Freezing point deprssion constant

Now,ΔT f =342×1000

1.86×68.5×1000

=0.372C

Now,ΔT f =T o −T f

So,T f =0−0.372=−0.372C.

(Freezing point of purewater=0

0

C.)