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)

Question

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) (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Y A =0.5 ⇒ YB=0.5 P A = P B =0.4 atm P A = P A 0 X A P A 0=2

Q. A gaseous mixture of two substances A and B, under a total pressure of 0.8atm 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)

YA​=0.5⇒YB​=0.5 PA​=PB​=0.4atm PA​=PA0​XA​ PA0​=2

$Y_{A} = 0.5 \Rightarrow Y_{B} = 0.5$
$P_{A} = P_{B} = 0.4 a t m$
$P_{A} = P_{A}^{0} X_{A}$
$P_{A}^{0} = 2$