At (T( ~K ) ), the vapour pressures of pure liquids (A ) and (B ) are (100 ~mm ) and (160 ~mm ) respectively. An ideal solution is formed by mixing 2 moles of (A ) and 3 moles of (B ) at the same temperature. The mole fraction of (A ) and (

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At (T( ~K ) ), the vapour pressures of pure liquids (A ) and (B ) are (100 ~mm ) and (160 ~mm ) respectively. An ideal solution is formed by mixing 2 moles of (A ) and 3 moles of (B ) at the same temperature. The mole fraction of (A ) and (B ) in the vapour state respectively are

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Correct answer: B. (0.294,0.706 )

Key Idea Vapour pressure of solution, (p_ total =p_A+p_ B^ = _A p_A^ + _B p_B^ [ p_A= _A p_A^ ] ) Also vapour pressure of component (1, p₁=y₁ p_ total ) where (y ), is the mole fraction of component 1 in vapour phase. Given, Vapour pressure of pure liquid (A, p_A^ =100 ~mm ) Vapour pressure of pure liquid (B, p_B^ =160 ~mm ) ( ) Total vapour pressure of solution (=p_A+p_B ) ( aligned p_ total & = _A p_A^ + _B p_B^ = 2 5 100+ 3 5 160 & =40+96=136 ~mm aligned ) Also ( p_A=y_A p_ total ) where, (y_A ) is the mole frac

At (T( ~K ) ), the vapour pressures of pure liquids (A ) and (B ) are (100 ~mm ) and (160 ~mm ) respectively. An ideal solution is formed by mixing 2 moles of (A ) and 3 moles of (B ) at the same temperature. The mole fraction of (A ) and (B ) in the vapour state respectively are

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