Q.

The weight of urea to be dissolved in 100 g. of water to decrease the vapour pressure of water by 5% is

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a

20 g.

b

14.66 g

c

15.24 g

d

16.66 g.

answer is D.

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Detailed Solution

Lowering of VP=5%Po-P=5%For very dilute solution, According to Raoult's law(M=mol.wt. , s=solute , o=solvent)Wurea=16.66g
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The weight of urea to be dissolved in 100 g. of water to decrease the vapour pressure of water by 5% is