Stoichiometry Reaction Calculator
Calculate reactant/product moles based on balanced equation ratios.
Simple Stoichiometry (A -> B)
Result
What is Stoichiometry?
Stoichiometry is the quantitative relationship between reactants and products in chemical reactions based on balanced equations.
It allows chemists to predict how much product will form or how much reactant is needed for a given reaction.
To convert grams to moles first, use our Mole & Molar Mass Calculator.
To calculate solution concentrations, try our Dilution Formula Calculator.
Formula
Moles B = Moles A × (Coef B / Coef A)
Based on the mole ratio from balanced equation coefficients.
Key Concepts
- • Mole Ratio: Comes from coefficients in the balanced chemical equation. For 2A → 3B, the ratio is 2:3.
- • Conservation of Mass: Matter is neither created nor destroyed in reactions. Total mass in = total mass out.
- • Limiting Reactant: The reactant that runs out first limits product formation. It determines theoretical yield.
- • Theoretical Yield: Maximum amount of product possible based on limiting reactant. Actual yield is often less.
- • Percent Yield: (Actual Yield ÷ Theoretical Yield) × 100%. Values below 100% indicate some product was lost.
- • Excess Reactant: The reactant left over after the limiting reactant is consumed. Can be recovered and reused.
How to Use This Calculator
Enter Coefficients
Input balanced equation coefficients.
Input Moles
Enter known moles of reactant A.
Calculate
Get moles of product B instantly.
Benefits of Using This Calculator
- • Quick Calculations: Instant mole ratio conversions for reactions.
- • Homework Helper: Solve stoichiometry problems step-by-step.
- • Lab Planning: Calculate exact amounts needed for experiments.
Stoichiometry Steps
- Balance the chemical equation.
- Convert given quantity (grams, liters) to moles.
- Use mole ratio to find moles of desired substance.
- Convert moles back to desired unit (grams, liters) if needed.
Frequently Asked Questions (FAQ)
Q: What is stoichiometry?
A: Stoichiometry is the calculation of reactants and products in chemical reactions. It is based on the law of conservation of mass.
Q: How do I find the limiting reactant?
A: The limiting reactant is the reactant that is completely consumed in a reaction. Calculate product moles from each reactant; the lowest yield indicates the limiting reactant.
Q: What is mole ratio?
A: The mole ratio is the ratio of moles of one substance to the moles of another substance in a balanced chemical equation.