Stoichiometry & Equation Balancer
Master chemical reactions with our all-in-one stoichiometry tool. Balance equations instantly and calculate reagents, products, and yields with precision.
Features Overview
⚖️ Equation Balancer
Simply enter any chemical equation (e.g., Al + O2 -> Al2O3) and our matrix-based solver will find the correct stoichiometric coefficients instantly. Supports parentheses and complex molecules.
🚫 Limiting Reagent Finder
Enter masses or moles for multiple reactants, and the calculator will automatically identify the limiting reagent and calculate the excess of other reactants.
📊 Theoretical & Percent Yield
Compare your actual experiment results with the theoretical maximum to calculate the percent yield and efficiency of your reaction.
🔄 Mol-Mass Conversions
Seamlessly switch between grams and moles. Molar masses are automatically calculated for every substance in your equation.
How to Use
- Enter the Equation: Type reactants and products separated by "->" or "=" (e.g.,
C3H8 + O2 -> CO2 + H2O). - Balance: The calculator updates automatically. Verify the balanced equation displayed below the input.
- Input Amounts: In the generated table, enter the known mass (g) or moles (mol) for any substance.
- View Results: All other values in the table will update instantly based on stoichiometry.
- Check Yield: If you have experimental data, select a product and enter the "Actual Yield" in the sidebar to see the percentage.
Common Stoichiometry Concepts
| Term | Definition | Formula |
|---|---|---|
| Mole (mol) | Standard unit for amount of substance | n = mass / MolarMass |
| Molar Mass | Mass of one mole of a substance (g/mol) | ∑ (Atomic Mass × Count) |
| Limiting Reagent | The reactant used up first, limiting product formation | Min(moles / coefficient) |
| Percent Yield | Efficiency of the reaction | (Actual / Theoretical) × 100% |
FAQ
Why is my equation showing an error?▼
Ensure you use standard chemical symbols (e.g., 'Cl' for Chlorine, not 'cl'). Separate reactants and products with "->" or "=". Make sure the equation is chemically valid (atoms must be conserved).
Can I input volume for gases?▼
Currently, this calculator works with Mass (g) and Moles (mol). For gases at STP, you can convert volume to moles manually (1 mol ≈ 22.4 L) before inputting, or use the Ideal Gas Law.
How does the Limiting Reagent finder work?▼
When you enter amounts for more than one reactant, the calculator computes the "moles per coefficient" ratio for each. The reactant with the lowest ratio is determined to be limiting, and all product calculations are based on this value.