(a) 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.
(b) Write two differences between ideal solutions and non-ideal solutions.
(a) Wurea = 30 g (WB) B = urea
Murae = 60 g/mol
Nurea
Wwater = 846 g (WA) A = water
Mwater = 18 g/mol
nwater = 47
ps = 23.55 mm hg
(b)
Ideal solution | Non-Ideal solution |
(1) Each component of a ideal solution obey Raoult's law in solution |
component of non-ideal solution dose not obey Rabcilt's law. |
(2) during formation of solution |