Vapour pressure of chloroform and dichloroethane at 298K are 200 mm Hg and 415 mm Hg respectively. If the mole fraction of chloroform is 0.312. calculate vapour pressure of the solution.

Explanation

Vapour pressure of chloroform `p_(1)^(0)=200` mm Hg
Vapour pressure of dichloroethane `p_(2)^(0)=415` mm Hg
Mole fraction of chloroform `n_(1)=0.312`
Mole fraction of dichloroethane `=n_(2)=1-0.312=0.6878`
`p_(T)=p_(1)^(@)x_(1)+p_(2)^(0)x_(2)`
`P_(T)=200xx0.312+415xx0.688`
`62.4+285.52=347.9` mm Hg.