Question

Q:Calculate the mass of sucroe (molecular mass=342) required to
dissolved per 600 ml 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.)

Hence, the correct option is A