Type an equation without coefficients —Fe2O3 + CO -> Fe + CO2, KMnO4 + HCl -> KCl + MnCl2 + Cl2 + H2O or MnO4^- + Fe^2+ + H^+ -> Mn^2+ + Fe^3+ + H2O— and get the smallest integer coefficients. Choose the method —trial and error, algebraic, matrix or all— and download the detailed PDF solution. You see trial and error (as done by hand, with the tries), the algebraic method (one unknown per species and one equation per element) and the matrix method (composition matrix and Gauss-Jordan), with exact fractions and the final check.
Atomic masses, ionization energies, melting points and names from Wikidata, public-domain data (CC0 1.0), checked one by one by Simuveliq. Atomic masses are the IUPAC standard ones.
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