1.

30 g of urea (M = "60 g mol"^(-1)) is dissolved in 846 g of water. Calculate the vapour pressure of water for this solution if vapour pressure of pure water at 298 K is 23.8 mm Hg.

Answer»

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SOLUTION :`(p^(@)-p_(s))/(p^(@))=(n_(2))/(n_(1))=(w_(2)//M_(2))/(w_(1)//M_(1))"(solution is TAKEN as dilute as it is less then 5%)"`
`(23.8-p_(s))/(23.8)=(30//60)/(846//18)"or"p_(s)=23.55mm`


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