Molecular Speed Of A Gas

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Presentation transcript:

Molecular Speed Of A Gas Depends on the mass of the gas molecules and the temperature they are at R is in different units and has a different value ( R=8.3145) M is in kg/mole

Example Find the speed of hydrogen gas at 25o C. Find the speed of oxygen gas at 25o C.

Effusion Gas escapes through tiny holes when a pressure difference is present

Diffusion Gases will mix uniformly

Graham’s Law Rate of both effusion and diffusion is inversely related to the square root of their weights Shows the relationship between rate and molecular weight

Example If an unknown gas effuses at a rate that is only .468 times that of oxygen at the same temperature, what is its molecular weight?