Chemistry
Molarity Reaction Calculator
Calculate available reactant amounts, supported reaction extents, limiting extent, theoretical product, isolated product, product mass, and ideal remaining reactants. A two-feed stoichiometric vessel diagram keeps the limiting reagent and yield loss visible.
Available reactant A (mol)-
Available reactant B (mol)-
Reaction extent supported by A-
Reaction extent supported by B-
Limiting reaction extent-
Theoretical product amount (mol)-
Expected isolated product (mol)-
Expected isolated product mass (g)-
Unreacted A after ideal reaction (mol)-
Unreacted B after ideal reaction (mol)-
Decision view
Stoichiometric reaction vessel
Stoichiometric reaction vesselBoth reactant feeds are normalized by coefficient before the limiting extent controls theoretical and isolated product.
Exact scenario comparisonReactant B volume (mL) changes while all other entered assumptions remain constant.
| Reactant B volume (mL) | Available reactant A (mol) | Available reactant B (mol) | Reaction extent supported by A | Reaction extent supported by B | Limiting reaction extent | Theoretical product amount (mol) | Expected isolated product (mol) | Expected isolated product mass (g) | Unreacted A after ideal reaction (mol) | Unreacted B after ideal reaction (mol) |
|---|
Stoichiometric detail
Reactant ledger and solution-volume scenarios
How to use Molarity Reaction Calculator
- Balance the chemical equation and enter coefficients exactly as written.
- Use concentration and volume values for the reactive species on a consistent basis.
- Review limiting extent before applying yield, purity corrections, or laboratory rounding.
Calculator guide
Understanding Molarity Reaction Calculator
A reaction calculation should reveal which reagent limits the balanced reaction. This page converts both solution entries to moles, normalizes them by stoichiometric coefficient, identifies the smaller reaction extent, and carries that constraint through theoretical and isolated product.
Calculation method
How the calculation works
Convert both solution volumes to reactant amounts, divide by stoichiometric coefficients to identify the limiting extent, and apply the entered product coefficient, molar mass, and isolated-yield assumption. Convert millilitres to litres, multiply by molarity, divide each amount by its balanced coefficient, use the smaller extent, multiply by the product coefficient, and then apply isolated yield and product molar mass.
Stoichiometric record
Keep the reaction basis auditable
A product mass is meaningful only when its chemical basis can be reconstructed.
Worked situations
Practical examples
- 0.8 mol/L multiplied by 0.250 L provides 0.200 mol of reactant A.
- A reagent with more moles can still be limiting when its coefficient is larger.
- An 85% isolated yield is applied after theoretical product is established.
Better inputs
Useful tips
- Keep purity and assay corrections separate unless concentration already incorporates them.
- Preserve unrounded moles until the final mass display.
- Record the balanced equation with the exported result.
Before relying on the result
Limitations and common mistakes
- Side reactions, equilibrium, kinetics, solvent effects, purity, and measurement uncertainty are excluded.
- Remaining reactant values are ideal stoichiometric amounts, not measured post-reaction concentrations.
- The page does not provide handling, hazard, disposal, or experimental instructions.
Reference
Key terms
- Reaction extent
- Available moles divided by the balanced stoichiometric coefficient.
- Limiting reagent
- The reactant supporting the smaller reaction extent.
- Theoretical product
- Product implied before processing or yield loss.
- Isolated yield
- The entered share of theoretical product expected after recovery.
Important note
Calculated from the entered values using the displayed chemical relationship. Confirm identity, units, purity, conditions, and laboratory safety requirements.
Frequently asked questions
Why divide moles by the coefficient?
Each complete reaction event consumes the coefficient amount, so the quotient shows supported reaction extent.
Can the higher-molarity solution be limiting?
Yes; volume and stoichiometric coefficient also determine available extent.
Does expected product include purity?
Only if the entered concentration or yield already incorporates purity.
Are remaining moles measured leftovers?
No. They are ideal stoichiometric remainders before equilibrium, losses, or side reactions.