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Stoichiometry Calculator

Convert between moles and grams and find unknown substance amounts from balanced reaction coefficients.

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Convert moles and masses using balanced equations

Stoichiometry links the coefficients in a balanced chemical equation to measurable grams and moles. Given a known mass of reactant A, you can predict how much product B forms when the reaction runs to completion with that limiting amount.

Related chemistry tools

Find theoretical yield with the Theoretical Yield Calculator, balance reactions with the Chemical Equation Balancer, and convert units with the Molar Mass Calculator.

Frequently Asked Questions

What is a mole?

One mole is $6.022 \times 10^{23}$ particles. In lab work, moles bridge atomic scale and grams through molar mass ($\text{g/mol}$).

Why do coefficients matter?

Coefficients show the mole ratio in the balanced equation. They scale the amount of substance B produced from a given amount of substance A.

Does this account for percent yield?

No. Results assume 100% conversion based on the limiting reagent. Multiply by actual yield for lab predictions.

Are calculations sent to a server?

No. Conversions run entirely in your browser.