110c-lecture14 - Composition of Vapor Phase is Different...

Info icon This preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Composition of vapor phase vs. solution phase: ( ) ( ) ( ) ln ln ln 2 1 2 2 s n s n s n x + = ( ) ( ) ( ) 2 * 2 2 * 1 1 * 2 2 2 1 2 2 1 2 2 x P x P x P x P P P vap n vap n vap n y + = + = + = (unless * 1 P = * 2 P .) If * 1 P = * 2 P , 2 2 x y = If * 1 P << * 2 P , then y 2 1 If * 2 P << * 1 P , then y 2 0. Note that * 1 * 2 1 2 * 1 1 * 2 2 1 2 P P x x P x P x y y = = and so 1 2 1 2 x x y y > when * 2 P > * 1 P . Vapor phase is more enriched with the more volatile component ( 1 2 1 2 x x y y > ) if * 2 P > * 1 P . Composition of Vapor Phase is Different from Solution Phase P i = n i RT/V * 1 P * 2 P gas liquid solution y j x j y 2 > x 2 y 2 < x 2 A(l) + B(l) A/B(sln) 1 2 * 2 2 * 1 1 P x P x P tot + =
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon