Limiting reagent calculator (with steps)
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Keep on to derive coefficients from elements; toggle off to use your own stoichiometric coefficients.
Round results to match the significant figures of your inputs.
| Species | Side | Coeff | Molar mass (g/mol) | Amount | Type | Purity (%) |
|---|
This mode assumes the chosen reactant is limiting and treats others as excess.
Frequently asked questions
How does this calculator determine the limiting reagent?
The tool converts each reactant to effective moles from unit and purity. It compares n0/ν across reactants, and the smallest value becomes the limiting reagent. The step log shows each conversion and ratio.
Can it estimate percent purity from a measured product mass?
Yes. Enter the suspect reactant mass, choose a target product, and add measured product mass. The tool back-solves product moles, scales by coefficients, and reports percent purity with steps.
How it's calculated
- From balanced equation and masses → moles; smallest moles limits the reaction.
- Computes theoretical yield for selected product.
- Share URL preserves inputs and coefficients.