Lecture_05

Let us denote this pressu re by pv the pressure is

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Unformatted text preview: where, initially, the total pressure acting on a liquid surface is the total pressure. Let us denote this pressu re by Pv. The pressure is then changed by the addition of an inert gas, keeping the temperature fixed, to get a final total pressure Pt. We wish to find the new value of the equilibrium vapor pressure P. For this situation, we may integrate this equation above to get V m,l P ln æ P ö = RT (P t − P v ), (5.23) è vø where we have assumed that the liquid volume does not change with applied pressure. This is called the Gibbs Equation. Problems 5.5, 5.17 3 5.4. Ideal Solutions: Raoult’s Law: Consider a solution formed by two miscible liquids A and B. An ideal solution is one for which Ÿ Vsoln = VA + VB. Ÿ ∆Hsoln = 0. Ÿ ∆Sm,soln = –R(xAln xA + xBln xB). Ÿ Gm,soln = RT(xAln xA + xBln xB). Ideal solutions obey Raoult’s law exactly. To state Raoult’s law, let us denote the mole fractions in the liquid phase by x and the mole fractions in the vapor phase by y. Also, we denote the v...
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This document was uploaded on 02/28/2014 for the course CHEM 311 at LA Tech.

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