Graham's Law (Effusion)Chemistry

Graham's Law of Effusion & Diffusion Velocity Calculator

Calculate relative gas effusion rates (Rate1/Rate2) and transit times as an inverse square root function of molecular weights according to Graham's Kinetic Law.

Calculated Result

Relative Effusion Rate (Rate 1 / Rate 2)

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Calculator Inputs

g/mol
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g/mol
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Relative Effusion Rate (Rate 1 / Rate 2)

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Gas 2 Effusion Time (t2)

10 s

Gas Effusion Velocity Ratio

Molar Mass 1
2.02 g/mol(6%)
Molar Mass 2
32 g/mol(94%)

Standard kinetic molecular theory tool for gaseous diffusion, effusion, and isotopic gas separation.

Calculation Methodology

Graham's Law: Rate_1 / Rate_2 = sqrt( Molar_Mass_2 / Molar_Mass_1 ). Time ratio: t_2 / t_1 = sqrt( M_2 / M_1 ). Lighter gas molecules effuse proportionally faster.

Frequently Asked Questions

Diffusion is the spontaneous mixing of gas particles through another medium via collisions, whereas effusion is the escape of gas molecules through a pinhole aperture without interparticle collisions.

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