Stoichiometry Calculator
Solve stoichiometry problems and calculate reactant-product relationships
Calculate Stoichiometric Ratios
Mole Ratio Formula:
n₂ = n₁ × (coefficient₂ / coefficient₁)
Where n = moles, coefficients are from the balanced equation
Example: 2.0
Example: 2
Example: 1
Optional: Calculate mass too
Result:
Frequently Asked Questions
What is stoichiometry?
Stoichiometry is the calculation of reactants and products in chemical reactions. It's based on the law of conservation of mass and uses balanced chemical equations to determine the quantitative relationships between substances.
How do you solve stoichiometry problems?
To solve stoichiometry problems: (1) Write and balance the chemical equation, (2) Convert given quantities to moles, (3) Use mole ratios from coefficients to find unknown moles, (4) Convert moles back to desired units (grams, liters, etc.).
What is a mole ratio?
A mole ratio is the ratio between the amounts in moles of any two compounds in a balanced chemical equation. It comes from the coefficients in the equation. For 2H₂ + O₂ → 2H₂O, the ratio of H₂ to H₂O is 2:2 or 1:1.
What is a limiting reactant?
The limiting reactant (or limiting reagent) is the reactant that gets completely consumed first in a chemical reaction, limiting the amount of product that can be formed. Other reactants present in excess remain after the reaction completes.
How do you find the limiting reactant?
To find the limiting reactant: (1) Convert all reactant amounts to moles, (2) Divide each by their coefficient from the balanced equation, (3) The reactant with the smallest result is the limiting reactant.
What is percent yield in stoichiometry?
Percent yield is the ratio of actual yield to theoretical yield, expressed as a percentage: (actual yield / theoretical yield) × 100%. It measures the efficiency of a reaction. A 100% yield means all reactants converted to products as expected.