How does the Limiting Reagent work?

Write and balance the chemical equation Then: Convert all reactant masses to moles Then: Divide moles of each reactant by its stoichiometric coefficient Then: The reactant with the smallest quotient is the limiting reagent.

Can you give an example of how to use the Limiting Reagent?

Example: Input 2H₂ + O₂ → 2H₂O · 4 mol H₂ and 1.5 mol O₂ gives a result of O₂ is limiting (need 2 mol O₂ for 4 mol H₂) (H₂ ratio: 4/2=2; O₂ ratio: 1.5/1=1.5 → O₂ limits).

Is the Limiting Reagent free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Limiting Reagent?

Our Limiting Reagent uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Limiting Reagent

⚗️Limiting Reagent Calculator

Moles of A

Coefficient of A

Moles of B

Coefficient of B

The limiting reagent is the reactant that is completely consumed first in a chemical reaction, determining the maximum amount of product that can form. The other reactants are "in excess." Identifying the limiting reagent is essential for calculating theoretical yield.

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Did You Know?

In cooking, the "limiting reagent" concept applies: a recipe needing 3 eggs when you only have 2 limits how many batches you can make — the eggs are the limiting ingredient.

References

›Limiting reagent — Wikipedia

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