Question

The increase in boiling point of a solution containing 0.6 g urea in 200 g water is 0.50° C, find the molal elevation constant.
(A) 1.0 K kg mol-1 (B) 10 K kg mol-1 (C) 10 K kg mol-1 (D) 10 K kg mol​

Answer 1

Answer:

option b is the correct answer

Answer 2

Answer

The increase in boiling point of a solution containing 0.6 g urea in 200 g water is 0.50

∘

C. Find the molal elevation constant.

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ANSWER

Molality, m=

weight of solution is kg

no. of moles of solute

m=

m

1

×W

2

1000×W

1

m=

60×200

1000×0.6

m=0.05m

[∵ Molecular weight of NH

2

CONH

2

=60]

Given, △T

b

=0.50

Now,

△T

b

=K

b

×m

or 0.50=K

b

×0.05

∴K

b

=10 K kg mol

−1

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