Phase equilibrium binary mixtures Chemistry 331
Chemistry 331 Phase Equilibrium Binary mixtures
liq vap eq. in Binary Mixtures Both the liquid and the vapor phase are binary mixtures of a and b xA, X B are the mole fractions in the liquid yA, yB are the mole fractions in the vapor PA,pAre the le partial pressures in the vapor Chemistry 331
Chemistry 331 liq vap Eq. in Binary Mixtures • Both the liquid and the vapor phase are binary mixtures of A and B. • x A, x B are the mole fractions in the liquid. • y A, y B are the mole fractions in the vapor. • p A, p B are the partial pressures in the vapor
Ethyl Acetate in Acetic Anhydride 800 700 600 500 300 200 100 0.0 02 04 06 0.8 1.0 Chemistry 331 thyl acetate
Chemistry 331 Ethyl Acetate in Acetic Anhydride 0 100 200 300 400 500 600 700 800 0.0 0.2 0.4 0.6 0.8 1.0 xethyl acetate p /torr
Raoult's law The vapor pressure of a substance varies linearly with its mole fraction in solution. I Raoult's law becomes exact as xa> Raoult's law becomes increasingly valid as the components of the mixture become more structurally similar Chemistry 331
Chemistry 331 • The vapor pressure of a substance varies linearly with its mole fraction in solution.\ pA= xA pA * • Raoult’s Law becomes exact as xA → • Raoult’s Law becomes increasingly valid as the components of the mixture become more structurally similar. Raoult’s Law
n-Pentane in Methyl Acetate 600 500 300 200 100 0 0.0 0.2 0.4 0.6 1.0 pentane Chemistry 331
Chemistry 331 n-Pentane in Methyl Acetate 0 100 200 300 400 500 600 0.0 0.2 0.4 0.6 0.8 1.0 p /torr xpentane