How do I format the reactant inputs?

Enter one reactant per line, starting with its stoichiometric coefficient, followed by the chemical formula, a comma, and the mass (e.g., '1 O2, 8.0 g').

Can I use mass units other than grams?

Yes, you can specify units like g, kg, or mg directly in the reactant mass field.

What is a limiting reagent?

It is the reactant that is completely consumed first in a chemical reaction, limiting the amount of product that can be formed.

How is the percent yield calculated?

It is calculated by dividing the actual yield by the theoretical yield and multiplying by 100.

Do I need to balance the chemical equation first?

Yes, you must include the correct stoichiometric coefficients from a balanced equation for both reactants and the target product.

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Reaction Stoichiometry Calculator

Determine the limiting reagent and compute theoretical yield, actual yield, and percent yield from a balanced reaction.

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1 examples

Limiting reagent in 2H2 + O2 → 2H2O

1.0 g H2 and 8.0 g O2. Hydrogen is limiting; theoretical yield of H2O ≈ 8.93 g.

{"result":"Limiting reagent: H2. Theoretical yield of H2O ≈ 8.936 g.","metadata":{"result":{"limitingReagent":"H2","theoreticalYield":8.936}}}

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4 options

ContentPaste or type the main input values.2

Reactants (name, formula, mass)textareaRequiredEach line: optional label, stoichiometric coefficient + chemical formula, and the available mass (g/kg/mg).Target Product FormulatextRequiredChemical formula of the product whose yield you want. Include its stoichiometric coefficient (e.g. 2 H2O).

SettingsAdjust formats, ranges, numbers, and modes.2

Actual Yield (g)numberOptionalDecimal PlacesnumberOptional

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Reaction Stoichiometry Calculator

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Examples

1. Water Synthesis Yield Calculation

2. Evaluating Synthesis Efficiency of Haber Process

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