Limiting Reagent Calculator

From Moles

Determine limiting reagent using moles of each reactant

Moles of Reactant A

Stoichiometric Coefficient of A

Moles of Reactant B

Stoichiometric Coefficient of B

Stoichiometric Coefficient of Product

From Mass (grams)

Determine limiting reagent from masses and molar masses

Mass of Reactant A (g)

Molar Mass of A (g/mol)

Coefficient of A

Mass of Reactant B (g)

Molar Mass of B (g/mol)

Coefficient of B

Coefficient of Product

Molar Mass of Product (g/mol)

Formula

Compare moles/coefficient for each reactant | Smallest ratio = limiting reagent | Theoretical yield = (moles of limiting / its coeff) × product coeff

Frequently Asked Questions

What is a limiting reagent?

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 reactant(s) are in excess.

How do I find the limiting reagent?

Divide the moles of each reactant by its stoichiometric coefficient. The reactant with the smallest ratio is the limiting reagent. Theoretical yield is calculated from the limiting reagent.

What is theoretical yield?

Theoretical yield is the maximum amount of product that can be formed from the limiting reagent, assuming 100% conversion. Actual yield is always less due to incomplete reactions, side reactions, and losses.

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