Balance a chemical equation: type the species with + between them and = or -> between the two sides, and get the balanced equation with its coefficients.
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From the article Chemical Equation Balancing — Rules and Worked Examples.
Skeleton: CH₄ + O₂ → CO₂ + H₂O
Carbon: 1 on the left, 1 on the right. Already balanced.
Hydrogen: 4 on the left, only 2 on the right. Put 2 before H₂O → 4 H on the right.
Oxygen last: right side now has 2 (in CO₂) + 2 (in 2H₂O) = 4 O atoms. Left side needs 4 O,
so put 2 before O₂.
CH₄ + 2O₂ → CO₂ + 2H₂O
Check — C: 1 = 1 · H: 4 = 4 · O: 4 = 4. ✔
Worked in full in Chemical Equation Balancing — Rules and Worked Examples.
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