Stoichiometry

Solve stoichiometry problems: mass and volume of a product, limiting reactant, percent yield, with a step-by-step solution.

What to find:

from one known substance

from two reactants (limiting reactant)

You can enter the equation without coefficients — the calculator balances it. Write substances as in the equation: Fe2O3, H2. Write formulas in Latin letters starting with a capital: H2SO4, Ca(OH)2, CuSO4·5H2O (water of crystallization after a dot or *).

Test yourself

The stoichiometry calculator solves typical problems: find the mass, volume or amount of a product (or reactant) from a known substance. The equation may be entered without coefficients — the calculator balances it. There is a limiting reactant mode and an optional percent yield.

Solution steps

Write the equation and balance it.
Find the amount of the known substance: n = m / M or n = V / 22.4.
Use the equation: the amounts are in the ratio of the coefficients, n(B) = n(A) · ν(B) / ν(A).
Find the mass m = n · M or the gas volume V = n · 22.4.

Limiting reactant

If the amounts of two reactants are given, divide each by its coefficient. The reactant with the smaller ratio is limiting — it reacts completely, and the calculation uses it.