Lecture9SHWeb

# Lecture9SHWeb - 1 Mon Sept 26 2011 Today’s Lecture •...

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Unformatted text preview: 1 Mon, Sept. 26, 2011 Today’s Lecture • Gases • 5.7 Effusion and Diffusion • 5.8-5.9 Collisions • 5.10 Real Gases • 5.11 Gases in the Atmosphere (omit) B avg 8k T 8RT u m M = = = = = = = = π π π π π π π π B mp 2k T 2RT u m M = = = = = = = = M RT 3 m N RT 3 u A rms = = Midterm Monday Oct 24, 6:30-8:30 pm Lecture 9 2 – Effusion of gases: • passage of gas molecules through a small hole into an evacuated chamber. 05_60 Gas Vacuum Pinhole 3 • rate of effusion measures rate at which the gas is transferred into the chamber • Graham’s law of effusion: • from kinetic theory: 2 1 M rate of effusion for gas 1 rate of effusion for gas 2 M = avg 1 1 avg 2 2 u for gas 1 8RT M M rate of effusion for gas 1 rate of effusion for gas2 u for gas 2 8RT M M π = = = = = = = = = = = = π 2 1 4 5 – Diffusion of gases: • ability of a gas to mix spontaneously with another gas • rate of diffusion is the rate of mixing of gases NH 3(g) + HCl (g) → NH 4 Cl (s) • diffusion is slow even though: molecular speeds (NH 3 ) = ∼ 660 m/s molecular speeds (HCl) =...
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Lecture9SHWeb - 1 Mon Sept 26 2011 Today’s Lecture •...

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