) and
dichloromethane (
)
at 298K are 200 mm Hg and 415 mm Hg respectively.
(i) Calculate the vapour pressure of the solution prepared
by mixing 25.5 g of and
40 g of at 298
K and
(ii) Mole fractions of each component in vapour
phase. [3]
Or
The vapour pressure of water is 12.3 kPa at 300K.
Calculate vapour pressure of 1 molal solution of a non-volatile solute in
it. [3]
Answer:
Mole fraction in vapour phase
Or
1 molal solution in water
mole solute in 1000 g water
(solute)
=1 mole 
mole;
(water)
[1]
[1]
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