The vapour pressure of mixture of toluene and xylene at `90^(@)`C is 0.5 atm. If at this temperature 400 mm and 150 mm respectively then what will be the mole fraction of toluene in mixture ?

Options

A. 0.08
B. 0.92
C. 0.88
D. 0.46

Answer

B

Explanation

`P_(s)=X_(A)P_(A)^(@)+(1-X_(A))P_(B)^(@)`