Presentation20_061120

Presentation20_061120 - T : temperature, K M : molar mass,...

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Chem 6A Presentation #20 2006-11-21 1 Overview Chapter 4: The Properties of Gases Distribution of particle speeds Deviation from ideality Van der Waals equation
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2 Distribution of particle speeds in a gas as a function of temperature v rms = 3 RT M Maxwell distribution: f v  = 4 M 2 RT 3 / 2 v 2 e − Mv 2 / 2 RT
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3 Distribution of particle speeds in a gas as a function of molar mass v rms = 3 RT M f v  = 4 M 2 RT 3 / 2 v 2 e − Mv 2 / 2 RT
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4 Calculating v rms v rms = 3 RT M For calculations, use consistent units, e.g. SI units: R : 8.314 (Pa·m 3 )/(mol·K) = 8.314 kg·m 2 ·s –2 ·mol –1 ·K –1
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Unformatted text preview: T : temperature, K M : molar mass, kg /mol 5 Deviation from ideality: V m / V m,ideal V m V m,ideal = P V m RT V m V m,ideal V m / V m,ideal > 1 V m / V m,ideal < 1 6 Deviation from ideality: van der Waals equation (Johannes van der Waals, 1873) P a n 2 V 2 V nb = nRT 7 Joule-Thomson effect Frost forms as air expands and cools. 8 Homework Chapter 4: Exercises: Odd-numbered exercises from 4.69 through 4.77 4.78, 4.83, 4.87, 4.93, 4.95, 4.98, 4.99, 4.101...
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Presentation20_061120 - T : temperature, K M : molar mass,...

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