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⚗️ Limiting Reactant Calculator

Determine which reactant limits the reaction and calculate theoretical yields

Chemical Equation

Enter a balanced equation using → or = as separator

Reactant Amounts

Quick Example: Hydrogen + Oxygen

Mass-Based Calculation

Limiting Reactant Concepts

Key Concepts:

Limiting Reactant:

The reactant that is completely consumed first, determining the maximum amount of product that can be formed.

Excess Reactant:

The reactant that remains after the reaction is complete. Some of this reactant will be left over.

Theoretical Yield:

The maximum amount of product that can be formed, determined by the limiting reactant.

Steps to Find Limiting Reactant:

  1. Write the balanced chemical equation
  2. Convert given amounts to moles
  3. Use stoichiometry to find required moles of each reactant
  4. Compare available vs. required amounts
  5. The reactant with insufficient amount is limiting
  6. Calculate theoretical yield using limiting reactant