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Lecture

01 Gases Kinetic Theory_3.pdf
01 Gases Kinetic Theory_3.pdf

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School
University of Alberta
Department
Chemistry
Course
CHEM102
Professor
A L L
Semester
Fall

Description
Under the same condition of PV rate of effusion of gas B 3RTM BThereforeRate of effusion of gas A3RTMARate of effusion of gas B 3RTM B Rate of effusion of gas AMBRate of effusion of gas BM A Thus the rate of effusion of a gas at constant temperature and pressure is inversely proportional to the square root of its molar massGrahams Law ExampleWhat is the ratio of effusion rates for helium to methane CH4 Diffusion is the movement of gas through another Diffusion is mixing of gasesDiffusion is slower than effusion due to collision of gas molecules Kinetic energy of gas moleculesNow that the kinetic energy KE of a gas molecule is given by2KE m For one mole of gas 2KE MMmolar mass From the kineticmolecular theory3RT 2M Therefore 10
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