Chemical Stoichiometry Calculator
Calculate theoretical yields and molar ratios based on balanced chemical equations.
Known Substance (Reactant/Product A)
Target Substance (Reactant/Product B)
Understanding Chemical Stoichiometry
Stoichiometry is the section of chemistry that involves using the relationships between reactants and/or products in a chemical reaction to determine desired quantitative data. In Greek, stoicheion means element and metron means measure.
How to Perform Stoichiometric Calculations
To use this stoichiometry calculator, follow these steps based on your balanced chemical equation:
- Balance the Equation: Ensure the number of atoms for each element is equal on both sides of the reaction.
- Find Molar Masses: Use the periodic table to find the molar mass of your known substance and your target substance.
- Calculate Moles: Divide the mass of your known substance by its molar mass.
- Use the Mole Ratio: Use the coefficients from the balanced equation to convert moles of substance A to moles of substance B.
- Convert back to Grams: Multiply the moles of substance B by its molar mass to find the theoretical yield.
Example: Combustion of Methane
Consider the reaction: CH₄ + 2O₂ → CO₂ + 2H₂O
If you have 16 grams of Methane (CH₄, molar mass 16.04 g/mol) and want to find how much Water (H₂O, molar mass 18.02 g/mol) is produced:
- Substance A: CH₄ (Coeff: 1, Mass: 16g, MW: 16.04)
- Substance B: H₂O (Coeff: 2, MW: 18.02)
- Result: Approximately 35.95 grams of H₂O.
Key Formulas Used
Moles = Mass (g) / Molar Mass (g/mol)
Moles B = (Moles A / Coefficient A) * Coefficient B
Mass B = Moles B * Molar Mass B
Moles B = (Moles A / Coefficient A) * Coefficient B
Mass B = Moles B * Molar Mass B