Question

vapour pressure of chloroform and dichloromethane at 298 k are 200mm of hg and 415mm of hg respectively.


1)calculate the vapour pressure of solution prepared by mixing 25.5 g of chloroform and 40g of dichloromethane at 298K.


2)mole fraction of each component in vapour phase.

Answer 1

We have been given the vales of vapour pressure of pure chloroform and dichloromethane,

to calculate the vapour pressure of the solution with the given composition, one can use

p=p0(chloroform)*mole fraction(chloroform) + p0(dichloromethane)*mole fraction(dichloromethane)

on the basis of the given data, one can calculate the values of mole fraction

On substituting in the above formuls the answer can be obtained.

to calculate the mole fraction of each component in the vapoyr phase, one can use the Dalton’s law of vapour pressure, according to which,

partial pressure = total pressure * mole fraction

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Answer 2

347.9 and the another answer is. 18