Question

Find the mass of sucrose (Molecular Mass=342) required to be dissolved per 600 cm^3 solution to prepare a semi molar solution. ​

Answer 1

Answer:

Explanation:

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.)