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12-3-07%20-%20Lecture%2020%20-%20Chapter%204

# 12-3-07%20-%20Lecture%2020%20-%20Chapter%204 - Daltons Law...

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Dalton’s Law Dalton’s Law John Dalton John Dalton 1766-1844 1766-1844

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Vapor Pressure of Water In a closed container, water vaporizes until its partial pressure has reached a certain value = vapor pressure
GAS DIFFUSION AND EFFUSION GAS DIFFUSION AND EFFUSION diffusion is the gradual mixing of molecules of different gases. i.e., perfume effusion is the movement of molecules through a small hole. i.e., balloon

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GAS DIFFUSION AND EFFUSION GAS DIFFUSION AND EFFUSION Molecules effuse thru holes in a rubber balloon, for example, at a rate (= moles/time) that is proportional to T 1/2 inversely proportional to M 1/2 Therefore, He effuses more rapidly than O 2 at same T. He He
Graham’s Law - governs effusion and diffusion of gas molecules. Thomas Graham, 1805-1869. Professor in Glasgow and London. Rate of effusion is inversely proportional to a gas’s molar mass. M of A M of B Rate for B Rate for A

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Effusion Time The time a given amount of gas takes to escape is inversely proportional to its rate: M of B M of A t effuse for B t effuse for A
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