Stoichiometry & gases · SL/HL
Atom Economy Calculator
Enter reactants as “coefficient molar-mass”, then the desired product coefficient and molar mass.
Your values
Start with the example or enter your own values. Use a dot for decimals and e for scientific notation.
Calculated locally. No account or input upload.
Result & working
ExampleThe calculator is loading. The worked example is also shown below.
Step-by-step working
The formula
atom economy = ν(desired product)M(desired product) / Σ[ν(reactant)M(reactant)] × 100%
| Symbol | Meaning |
|---|---|
| ν | Balanced-equation coefficient. |
| M | Molar mass. |
When to use this calculator
Atom economy is a theoretical stoichiometric measure. It is different from percentage yield, which compares actual and theoretical product obtained.
Worked example
The page opens with these example values. The result below is pre-generated for reference.
- Reactant contribution: 1 × 60.05 = 60.05 g per stoichiometric reaction
- Reactant contribution: 1 × 32.04 = 32.04 g per stoichiometric reaction
- Desired-product contribution = 1 × 74.08 = 74.08
- Atom economy = 74.08 / 92.09 × 100 = 80.44304%
80.44304%
Common mistakes
- Balance the equation first.
- Do not substitute experimental yield into atom economy.