What is the Limiting Reactant Calculator?

The Limiting Reactant Calculator is a chemistry tool designed to help students, teachers, and lab users determine which reactant will run out first in a chemical reaction, thereby limiting the amount of product that can be formed. By entering the masses and molar masses of reactants along with the stoichiometric ratio, the calculator computes which reactant is limiting, ensuring accurate reaction planning and preventing errors in laboratory calculations.

How to Use:

1. Enter Mass of Reactant A (g): Input the weight of the first reactant in grams.
2. Enter Molar Mass of Reactant A (g/mol): Input the molar mass of Reactant A.
3. Enter Mass of Reactant B (g): Input the weight of the second reactant in grams.
4. Enter Molar Mass of Reactant B (g/mol): Input the molar mass of Reactant B.
5. Enter Stoichiometric Ratio (A:B): Input the molar ratio of Reactant A to Reactant B as used in the chemical reaction.
6. Click “Calculate”: The tool computes the number of moles for each reactant, compares them according to the stoichiometric ratio, and identifies the limiting reactant.
7. Review Result: The output shows which reactant is limiting, or if both reactants are in exact stoichiometric amounts, helping you plan the reaction efficiently.