🎓 Chemistry • Stoichiometry
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Stoichiometry Calculator
Computes stoichiometric mole ratios between reactants and products in balanced chemical equations.
Balanced Reaction Presets1-click populate
Reaction Stoichiometry: a A → b B
Reactant A (Given)
Target Species B (Yield)
Mole Conversion Factor: b / a = 3 / 1
Stoichiometric Mole Bridge Flowchart
Theoretical Yield of Product B
7.5 mol
CO2 (Carbon Dioxide)
Mass Yield
330.075 g
Gas Vol @ STP (0°C, 1 atm)
168.105 L
Molecule Count
4.5166e+24
Dimensional Analysis Derivation
1. Moles of A:
2.5 mol of C3H8 (Propane)2. Stoichiometric Ratio: $n_B = n_A \times \frac{b}{a} = 2.5\text{ mol} \times \frac{3}{1} = 7.5\text{ mol}$
3. Mass of B: $m_B = n_B \times M_B = 7.5\text{ mol} \times 44.01\text{ g/mol} = 330.075\text{ g}$
What is Chemical Stoichiometry?
Stoichiometry is the quantitative relationship between reactants and products in a balanced chemical reaction based on the law of conservation of mass.
Formula & Step-by-Step Calculation
n_product = n_reactant × (Coeff_product / Coeff_reactant)
Stoichiometric mole ratio conversion.
Worked Step-by-Step Examples
Example 1
Reaction: 2 H2 + O2 -> 2 H2O. How many moles of H2O from 4 moles of H2?
Solution: 4.000 moles of H2O
• 4 mol H2 × (2 mol H2O / 2 mol H2) = 4.000 mol
Common Real-World & Academic Use Cases
- ✓ Chemical factory yield optimization
- ✓ Limiting reagent identification
- ✓ Theoretical yield vs actual yield percentage
How to Use the Stoichiometry Calculator
1
Enter Coefficients
Input stoichiometric coefficients A and B.
2
Input Moles of Reactant
Fill in available moles.
3
Read Product Moles
Inspect theoretical product moles produced.
Frequently Asked Questions
Q: What is a limiting reactant?
The reactant that is completely consumed first, limiting the maximum amount of product that can be formed.