PPT Slide

• Grahamís law can be used to determine the molar mass of an  unknown gas.

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The effusion rate of an unknown gas, X, is determined relative to of a known gas, such as He:

Problem: Calculate the ratio of the effusion rates of helium and methane.

Solution:

• Gaseous diffusion, the movement of one gas through another, is  also described quantitatively by Grahamís law.

Skill 5-7. Using Grahamís law to solve gaseous effusion problems

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