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A gaseous mixture of two substances A and B , under a total pressure of 0 . 8 atm is in equilibrium with an ideal liquid solution. The mole fraction of substance A is 0 . 5 in the vapour phase and 0 . 2 in the liquid phase. The vapour pressure of pure liquid A is____atm.(Nearest integer)

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0

Step-by-step solution

Raoult’s law states that a solvent’s partial vapour pressure in a solution (or mixture) is equal or identical to the vapour pressure of the pure solvent multiplied by its mole fraction in the solution. Raoult’s law is valid only in the case of ideal solutions P A = P o A χ A According   to   Raoult ' s   law P A = P T Y A According   to   Dalton ' s   law P T = Total   pressure P A = vapour   pressure   of   A   in   solution P o

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