Chemistry / Chem 1300 · Atom · ~20 seconds
Graham's Law of Effusion
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State
A gas's rate of effusion is inversely proportional to the square root of its molar mass.
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Helium, far lighter than oxygen, effuses through a pinhole several times faster than oxygen does under identical conditions.
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The ratio of effusion rates scales with the square root of the inverse molar-mass ratio, not with molar mass directly.