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Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 298 K are 200 mm Hg and 415 mm Hg respectively. (i) Calculate the vapour pressure of the solution prepared by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at 298 K and, (ii) mole fractions of each component in vapour phase.

Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 298 K are 200 mm Hg and 415 mm Hg respectively. (i) Calculate the vapour pressure of the solution prepared by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at 298 K and, (ii) mole fractions of each component in vapour phase.

Grade:11

1 Answers

Sakshi
askIITians Faculty 652 Points
8 years ago
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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