Home Categories Chemistry & Materials Science Stoichiometry Calculator
Chemistry & Materials Science

Stoichiometry Calculator

Calculate the exact mass of a product produced from a given mass of reactant based on their stoichiometric coefficients.

g
NaN

Calculated locally in your browser. Fast, secure, and private.

Perform rapid mass-to-mass conversions using balanced chemical equations. This stoichiometry calculator determines the exact mass of product generated from a specific amount of reactant, streamlining your theoretical lab preparations.

Stoichiometric Ratios

Stoichiometry relies on the conservation of mass and the molar ratios established by balanced chemical equations. By converting grams to moles, applying the molar ratio, and converting back to grams, you can accurately predict yields.

mp=(mrMr)×(CpCr)×Mp\begin{aligned} m_p = \left( \frac{m_r}{M_r} \right) \times \left( \frac{C_p}{C_r} \right) \times M_p \end{aligned}

Where:
mpm_p=
Mass of Product (g)
mrm_r=
Mass of Reactant (g)
MrM_r=
Molar Mass of Reactant (g/mol)
MpM_p=
Molar Mass of Product (g/mol)
CpC_p=
Coefficient of Product
CrC_r=
Coefficient of Reactant

Mass-to-Mass Workflow

  1. Divide the mass of your reactant by its molar mass to find moles.
  2. Multiply by the ratio of the product's coefficient to the reactant's coefficient.
  3. Multiply the resulting moles by the product's molar mass to find the final mass.

Frequently Asked Questions

Stoichiometry ensures that chemical reactions are balanced and predictable, allowing chemists to calculate exact quantities of reactants needed to produce a desired amount of product without wasting materials.

Absolutely. The coefficients in a balanced chemical equation dictate the molar ratios. Without them, you cannot determine how many moles of product are created per mole of reactant.

Yes. For gases at standard temperature and pressure (STP), you can convert moles to volume using the ideal gas constant (22.4 L/mol) instead of converting to mass.

It is the ratio of moles of one substance to another in a balanced chemical equation. For example, if 2H2+O2→2H2O2H_2 + O_2 \rightarrow 2H_2O, the ratio of hydrogen to water is 2:2, or 1:1.

Chemical reactions happen atom-by-atom, not gram-by-gram. Since different elements have different atomic weights, comparing grams directly is impossible; moles provide the universal standard for counting particles.

Related Calculators in Chemistry & Materials Science

Molar Mass Calculator

Try It Now

Molarity Calculator

Try It Now

Molality Calculator

Try It Now