Limiting Reagent Product Yield

What is this formula?

This formula calculates the theoretical amount of product that can be formed from a known quantity of limiting reagent using the stoichiometric coefficients of the balanced chemical equation.

When to use it

Use this equation after identifying the limiting reagent in a chemical reaction. It is one of the most common calculations in organic synthesis, industrial chemistry, and laboratory work.

Example

Reaction:

2 H2 + O2 → 2 H2O

Given:

Limiting reagent H2 = 3.0 mol

Stoichiometric coefficient of H2 = 2

Stoichiometric coefficient of H2O = 2

Formula:

nprod = nlim × (νprod/νlim)

Substitution:

nprod = 3.0 × (2/2)

Result:

nprod = 3.0 mol

The reaction can theoretically produce 3.0 mol of water.

Applications

Organic synthesis

Reaction planning

Laboratory calculations

Industrial chemistry

Chemical engineering

Note

This formula predicts the theoretical amount of product assuming complete conversion of the limiting reagent and no side reactions. Actual production is often lower due to incomplete conversion, competing reactions, purification losses, or operational inefficiencies. Experimental yield is evaluated separately using reaction yield formulas.