Limiting-reagent method
For each reactant, divide available moles by its balanced coefficient. The smaller normalized amount is the reaction extent. Multiply that extent by the product coefficient to obtain theoretical product moles.
Percent yield
When an actual product amount is entered, percent yield = actual ÷ theoretical × 100. Keep actual and theoretical amounts in the same unit, and do not round the theoretical value early.
Common mistakes
- Using unbalanced coefficients.
- Comparing raw moles without dividing by coefficients.
- Mixing grams and moles without a molar-mass conversion.
- Treating theoretical yield as a guaranteed measured outcome.
Use the Molar Mass Calculator before entering mass-based data.
Frequently asked questions
Does this balance a chemical equation?
No. Enter coefficients from an already balanced equation.
Why can leftover moles be zero?
The limiting reactant is consumed at the theoretical endpoint; the other reactant may remain in excess.