Free Graham's Law Calculator
Calculate the ratio of effusion or diffusion rates of two gases using Graham's Law, based on their molar masses.
g/mol
g/mol
Rate₁ / Rate₂
4.0000
Rate₁ / Rate₂ vs Molar Mass of Gas 1
Graham's Law of Effusion
Formula
Rate₁ / Rate₂ = √(M₂ / M₁)
Where:
Lighter gases effuse faster. The rate is inversely proportional to the square root of molar mass.
Example Calculation
Compare effusion rates of H₂ (2 g/mol) and O₂ (32 g/mol).
- 01Rate₁/Rate₂ = √(M₂/M₁)
- 02Rate₁/Rate₂ = √(32/2)
- 03Rate₁/Rate₂ = √16
- 04Rate₁/Rate₂ = 4.0
- 05H₂ effuses 4 times faster than O₂
Frequently Asked Questions
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