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What mass of urea be dissolved in 171 g ...

What mass of urea be dissolved in `171 g` of water so as to decrease the vapour pressure of water by `5%`?

A

15 g

B

20 g

C

25 g

D

30 g

Text Solution

Verified by Experts

`(DeltaP)/(P_(A)^(@))=chi_(B)=0.05` (given)
`0.05=(n_(B))/(n_(B)+n_(A))=(n_(B))/(n_(B)+171/18)impliesn_(B)=0.5impliesg_("urea")=0.5xx60=30gm` [ Urea `: NH_(2)CONH_(2)`]
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