(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 $= \frac{W}{M}= \frac{30}{60}= 0\cdot 5$
Wwater = 846 g (WA) A = water
Mwater = 18 g/mol
nwater = 47
$\frac{p^{0}_{A}-ps}{p^{0}_{A}}= \frac{n_{B}}{n_{A}+n_{B}}$
$\frac{23\cdot 8-ps}{23\cdot 8}= \frac{0\cdot 5}{47+0\cdot 5}$
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)$\Delta H_{mix}= 0,$ i.e no heat is evolved or absorbed during formation of solution $\Delta H_{mix}\neq 0,$ i.e heat is either evolved or absorbed during the formation of solution

Related Chapters

Preparation Products

Knockout NEET July 2020

An exhaustive E-learning program for the complete preparation of NEET..

₹ 15999/- ₹ 6999/-
Rank Booster NEET 2020

This course will help student to be better prepared and study in the right direction for NEET..

₹ 9999/- ₹ 4999/-
Knockout JEE Main July 2020

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 12999/- ₹ 6999/-
Test Series NEET July 2020

Take chapter-wise, subject-wise and Complete syllabus mock tests and get in depth analysis of your test..

₹ 4999/- ₹ 2999/-