Home > Uncategorized > Thermodynamics and Kinetics Lecture 21 Notes: Multicomponent Systems

Thermodynamics and Kinetics Lecture 21 Notes: Multicomponent Systems

Overview
Today’s lecture costs about 50 minutes.

Details
We now have more than one constituent and more than one phase.

Xa = Xa. Xb = 1-Xa. Ya=Ya. Yb = 1-Ya. Two components in the gas phase, two in the liquid.

Raolt’s Law:
Pa = xa P a pure

Again, he shows the P versus Xb/Yb graph. On top is the liquid phase, on the bottom is the gas phase. You’ve got a solid line with a curved line below it.

Lever Rule determines how much of each component is in each phase.
Na – Nb = total number of moles A,B
Ng – Nl = total number fo moles in gas/liquid

The ratio of gas to liquid:
ng(2)/nl(2) = (Xa2-Ya1)/(Ya1-Ya2)

T and x or mole fraction phase diagrams are more practical in the lab because P is constant. Dew line on top, bubble line on the bottom. Gas phase above, liquid phase below.

Distillations condense the liquids, boil again, and so on.

Review
Intermolecular forces: ionic, h bonding, dipole dipole, VdW

Retention Factor Rf = Rx/R solvent

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