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Unformatted text preview: ses through a hole in 38 seconds. what must be the molecular weight of gas that effuses in 55 seconds under identical conditions?
53 54 Examples Diffusion
The spreading of a gas through a room. Slow considering molecules move at 100's of meters per second. Collisions with other molecules slow down diffusions. Best estimate is Graham's Law. 9 Real Gases
Real molecules do take up space and they do interact with each other (especially polar molecules). Need to add correction factors to the ideal gas law to account for these. Volume Correction
The actual volume free to move in is less because of particle size. More molecules will have more effect. Bigger molecules have more effect Corrected volume V' = V - nb b is a constant that differs for each gas. P' = nRT (V-nb) (V- 55 56 Pressure correction
Because the molecules are attracted to each other, the pressure on the container will be less than ideal gas Depends on the type of molecule depends on the number of molecules per liter. since two molecules interact, the effect must be squared.
57 58 Pressure correction
Because the molecules are attracted to each other, the pressure on the container will be less than ideal depends on the number...
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