SABIC CHEM 101 Chapter 5 - Part 8

SABIC CHEM 101 Chapter 5 - Part 8 - EusionofaGas Effusion...

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Efusion oF a Gas Effusion describes the passage of a gas through a tiny orifice into an evacuated chamber. The rate of effusion measures the speed at which the gas in transferred into the chamber.
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Graham’s Law of EFusion Thomas Graham (1805-1869): Experimentally determined that the rate of effusion of a gas is inversely proportional to the square root of the mass of the particles. http://www.youtube.com/watch?v=0uBK7VxT00E&feature=related
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Graham’s Law of EFusion We can relate the rates of effusion for two gases at the same temperature and pressure as the inverse ratio of the square roots of the masses of the gas particles: M 1 and M 2 represent the molar masses of the gases. Thomas Graham (1805-1869): Experimentally determined that the rate of effusion of a gas is inversely proportional to the square root of the mass of the particles.
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Worked Example
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Example Gas A is 0.68 times as fast as gas B. The mass of B is 17 g. What is the mass of A?
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Example It took 4.5 minutes for 1.0 L of helium to effuse through a porous barrier.
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SABIC CHEM 101 Chapter 5 - Part 8 - EusionofaGas Effusion...

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