SO2 + O2 = SO3 - Balanced Chemical Equation
https://www.chemicalaid.com/tools/equationbalancer.php?equation=SO2+%2B+O2+%3D+SO3&hl=en
WEBInstructions. To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above. Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored.
DA: 93 PA: 82 MOZ Rank: 18