Rate of Effusion Calculator

Molar Mass of Gas 1 (g/mol): Molar Mass of Gas 2 (g/mol):

Rate of Effusion Ratio: —

How to Use This Calculator

Enter the molar masses of two gases to calculate the relative rate of effusion using Graham's Law.

This tool helps students, educators, and chemists quickly apply Graham's Law of Effusion to compare the rates at which different gases diffuse.

Rate₁ / Rate₂ = √(M₂ / M₁)

Where:

If gas 1 has a molar mass of 4 g/mol (e.g., Helium) and gas 2 has a molar mass of 16 g/mol (e.g., Methane), then:

Rate₁ / Rate₂ = √(16 / 4) = √4 = 2

This means gas 1 effuses twice as fast as gas 2.