Calculate the vapour pressure at 295 K of a 0.1 M solution of urea. The density of the solution may be taken as `1g//cm^(3)`. The vapour pressure of pure wa ter at 295 K is 20 mm.

Answer

19.96 mm

Explanation

0.1 M solution of urea means 0.1 mol, i.e., 6.0 g of urea are dissolved per litre of solution =, i.e., in 1000 g of solution (`because " density = "1g//cm^(3)`). Hence, `w_(2)=6.0g, w_(1)=1000-6.0=994g, p^(@)=20,,` (Given), `p_(s)`= To be calculated.