Liquids A and B form an ideal solution in the entire composition range. At 350K, the vapor pressure of pure A and pure B are `7xx10^(3)` Pa and `12xx10^(3)` Pa, respectively. The composition of the vapor in equilibrium with a solution containing 40 mole percent of A at this temperature is :

Answer

4

Explanation

`P__(A)^(@)=7xx10^(3)P_(a)`
`P_(B)^(@)=12xx10^(3)P_(a)`
`P_(A)=P_(A)^(@)x_(A)` `P_(B)=P_(B)^(@)x_(B)`
`=[7xx10^(3)][0.4]=[12xx10^(3)][0.6]`
`=2.8xx10^(3)=7.2xx10^(3):P_(T)=1xx10^(4)Pa`