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The vapour pressure of ethyl alcohol at ...

The vapour pressure of ethyl alcohol at `25^@C` is 59.2 torr. The vapour pressure of a solution of urea in ethyl alcohol is 51.3 torr. What is the molality of the solution?

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`P_A^0=59.2 "torr" , P_("sol")=51.3 "torr"`
`rArr (DeltaP)/(P_A^0)=chi_B=(59.2-51.3)/(59.2)=0.133 , m=(chi_B)/(1-chi_B) xx(1000)/(M_A)=(0.133)/(1-0.133)xx(1000)/(46) rArr m= 3.33`
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