Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Reactant A moles (mol)

Available amount of reactant A.

Reactant B moles (mol)

Available amount of reactant B.

Stoichiometric ratio B:A

Moles of B required per mole of A.

Identify the limiting reagent and the product amount for a reaction needing ratioAB moles of B per mole of A. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Limiting reagent

Which reactant limits the reaction.

Product moles (mol)

Maximum producible amount of product.

• Stoichiometric results assume the balanced reaction, stated purity, and complete conversion to the selected products. Yield, selectivity, side reactions, moisture, and measurement uncertainty must be handled separately.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Turnover Frequency

  Compute the catalyst turnover frequency as moles of product formed per second per mole of catalyst.

• Limiting Reagent Excess Amount Calculator

  Compute the leftover moles of an excess reagent after complete consumption of the limiting reagent.

• Theoretical Yield Calculator

  Compute the maximum product mass from the limiting reagent amount and product molar mass.