Chemistry
Limiting Reagent Calculator
Limiting Reagent Calculator identify the limiting reagent for two reactants and calculate theoretical product moles, mass, and excess-reactant remainder.
Chemistry
Limiting Reagent Calculator
Identify the limiting reagent for two reactants and calculate theoretical product moles, mass, and excess-reactant remainder.
Formula
Reaction extents are moles/coefficient; the smaller extent limits product = extent x product coefficient.
About the Limiting Reagent Calculator
Identify the limiting reagent for two reactants and calculate theoretical product moles, mass, and excess-reactant remainder.
How the Limiting Reagent Calculator Works
Both reactant masses are converted to moles and divided by balanced coefficients, then the smaller reaction extent determines product and unused excess moles.
Formula
Reaction extents are moles/coefficient; the smaller extent limits product = extent x product coefficient.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Reactant A name (required).
- Reactant A mass (required) - enter in g.
- Reactant A molar mass (required) - enter in g/mol.
- Reactant A coefficient (required).
- Reactant B name (required).
- Reactant B mass (required) - enter in g.
- Reactant B molar mass (required) - enter in g/mol.
- Reactant B coefficient (required).
- Product coefficient (required).
- Product molar mass (required) - enter in g/mol.
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Limiting reagent
- Maximum reaction extent (mol reaction)
- Theoretical product (mol)
- Theoretical product mass (g)
- Excess reactant remaining (mol)
- Reactant A reaction capacity
- Reactant B reaction capacity
Limiting Reagent Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Reactant A name | A |
| Reactant A mass | 10 g |
| Reactant A molar mass | 20 g/mol |
| Reactant A coefficient | 2 |
| Reactant B name | B |
| Reactant B mass | 15 g |
| Reactant B molar mass | 30 g/mol |
| Reactant B coefficient | 1 |
| Product coefficient | 2 |
| Product molar mass | 44 g/mol |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
Use pure-reactant masses and a correctly balanced equation. Solutions, purity, side reactions, incomplete conversion, equilibrium, and more than two reactants require extra treatment.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Frequently Asked Questions
What does the Limiting Reagent Calculator calculate?
Identify the limiting reagent for two reactants and calculate theoretical product moles, mass, and excess-reactant remainder.
Which formula does the Limiting Reagent Calculator use?
Reaction extents are moles/coefficient; the smaller extent limits product = extent x product coefficient. Both reactant masses are converted to moles and divided by balanced coefficients, then the smaller reaction extent determines product and unused excess moles.
What should I check before using the Limiting Reagent Calculator result?
Use pure-reactant masses and a correctly balanced equation. Solutions, purity, side reactions, incomplete conversion, equilibrium, and more than two reactants require extra treatment.