Stoichiometry Calculator
Solve any stoichiometry problem from a balanced equation — compute moles, mass, gas volume (ideal gas), and solution amounts for every reactant and product, with limiting reagent finder, percent yield, and mass-conservation verification
Use →, =>, -> or = as the arrow. Supports parentheses like Ca(OH)2 and hydrates like CuSO4·5H2O.
✓ Equation is balanced
Known Quantity
g
applies to products
Stoichiometric Amounts
| Side | Species | M (g/mol) | Moles | Mass (g) | Gas @ STP (L) |
|---|---|---|---|---|---|
| REACTANTGIVEN | 2Al | 26.982 | 3.706e-1 | 10.000 | 8.307 |
| REACTANT | Fe2O3 | 159.687 | 1.853e-1 | 29.591 | 4.154 |
| PRODUCT | Al2O3 | 101.961 | 1.853e-1 | 18.894 | 4.154 |
| PRODUCT | 2Fe | 55.845 | 3.706e-1 | 20.697 | 8.307 |
Mass Conservation Check
✓ Σ reactant mass = 39.5914 g · Σ product mass (theoretical) = 39.5914 g · diff = 7.11e-15 g
Limiting Reagent Finder
Enter the mass (g) of each reactant. Tool finds which one runs out first and computes the actual extent.
| Reactant | Moles | ξᵢ = n/ν | Excess / Remaining |
|---|---|---|---|
| Al | 0.3706 | 0.1853 | 0.2454 mol (6.62 g) |
| Fe2O3(LIM) | 0.0626 | 0.0626 | 0 |
About Stoichiometry
Stoichiometry uses the balanced equation's mole ratios to compute amounts of all reactants and products from any known quantity. The extent of reaction ξ (xi) equals Δnᵢ / νᵢ, where νᵢ is the stoichiometric coefficient. All species react in the same extent, so moles of species j = ξ × νⱼ.
Common Conversions
moles = mass / Mmoles = PV / RT(ideal gas)moles = V × C(solution)- 1 mol gas @ STP = 22.414 L
- R = 0.08206 L·atm/(mol·K)
Uses IUPAC 2021 standard atomic weights. Ideal-gas assumption applies; real gases deviate at high pressure / low temperature.
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