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12.0 g urea is dissolved in 1 litre of w...

12.0 g urea is dissolved in 1 litre of water and 68.4 g sucrose is dissolved in 1 litre of water. The relative lowering of vapour pressure of urea solution is

A

3.0 g

B

17.1 g

C

6.0 g

D

34.2 g

Text Solution

Verified by Experts

The correct Answer is:
B
Boiling point `prop(w)/(m)`, Hence
`m_(1)w_(2)=m_(2)w_(1)`
`60gxxw_(2)=342gxx3g`
`w_(2)=(342gxx3g)/(60g)=17.1g`.
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