`6g` of urea ( molecular weight `=60)` was dissolved in `9.9` moles of water. If the vapour pressure of pure water is `P^(@)`, the vapour pressure of solution is `:`

Options

A. `0.10 P_(o)`
B. `1.10 P_(o)`
C. `0.90 P_(o)`
D. `0.99 P_(o)`

Answer

C

Explanation

`(P^(o)-P_(s))/(P^(o))=(n)/(N)implies(P^(o)-P_(s))/(P^(o))=(1)/(9.9)implies9.9P^(o)-9.9P_(s)=P^(o)`
`8.9P^(o)=9.9P_(s)impliesP_(s)=(8.9)/(9.9)P^(o)~~0.90P^(o)`