Hydrogen and Oxygen
Molar Mass of Gas 1 (M1): 2.016 g/mol; Molar Mass of Gas 2 (M2): 32 g/mol
Rate Ratio (Rate1/Rate2): 3.984095364 unitless; Rate 2 is slower than Rate 1 by: 3.984095364 times; Rate 1 is faster than Rate 2 by: 3.984095364 times
Graham's Law of Effusion Calculator
Chemistry0.0(0)
Calculates the relative rate of effusion of two gases using Graham's Law, which states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass.
More tools:Science & Lab Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Molar Mass of Gas 1 (M1) and Molar Mass of Gas 2 (M2) in the units shown.
Step 2
Read Rate Ratio (Rate1/Rate2), Rate 2 is slower than Rate 1 by, and Rate 1 is faster than Rate 2 by in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Helium and Nitrogen
Molar Mass of Gas 1 (M1): 4 g/mol; Molar Mass of Gas 2 (M2): 28.01 g/mol
Rate Ratio (Rate1/Rate2): 2.646223724 unitless; Rate 2 is slower than Rate 1 by: 2.646223724 times; Rate 1 is faster than Rate 2 by: 2.646223724 times
Ammonia and Hydrogen Chloride
Molar Mass of Gas 1 (M1): 17.031 g/mol; Molar Mass of Gas 2 (M2): 36.46 g/mol
Rate Ratio (Rate1/Rate2): 1.463147999 unitless; Rate 2 is slower than Rate 1 by: 1.463147999 times; Rate 1 is faster than Rate 2 by: 1.463147999 times
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