Choose a verified equation
Start with a curated balanced equation so the coefficient ratio is visible.
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Follow a balanced equation from a known quantity to moles, mass, particles, and an optional limiting-reactant result.
Start with a curated balanced equation so the coefficient ratio is visible.
Move from grams to moles using the selected compound's molar mass.
Calculate product moles, mass, particles, and limiting reactant when applicable.
Method
The engine first converts a known mass to moles where needed, applies the selected equation's coefficient ratio, then converts target moles to mass and particle count. Limiting-reactant mode compares reaction extent for two reactants.
2H₂ + O₂ → 2H₂O. Four grams of H₂ is about two moles. The 2:2 ratio gives two moles of H₂O, or about 36.03 grams under ideal assumptions.
Stoichiometry uses the coefficients in a balanced chemical equation to relate reactant and product quantities.
No. It uses a curated set of already balanced equations so the coefficient ratios are explicit and verifiable.
Yes. Enter a known mass in grams or an amount in moles; the engine converts mass using the selected compound's bundled molar mass.
When two reactant amounts are supplied, the limiting reactant is used up first and sets the maximum product amount.
It is the target mole amount multiplied by Avogadro's constant, 6.02214076 × 10²³ particles per mole.
The tool uses standard rounded molar masses appropriate for introductory calculations. Use course-specific values when your assignment requires them.
No. Results assume an ideal complete reaction. Real experiments may differ due to yield, purity, side reactions, and conditions.
Yes. Download CSV or JSON; both use the same result shown in the planner.
No. It provides calculations only. Follow your school, laboratory, and chemical-safety procedures.
No. This version calculates in the browser and does not create a cloud history.