Using oxidation and reduction half-reactions, balance the skeletal equation cl2o7(g) + h2o2(aq) → clo− 2 (aq) + o2(g) of the production of chlorite ions from dichlorine heptoxide. the reaction takes place in a basic solution. what is the smallest possible integer coefficient of o2 in the combined balanced equation?

Unbalanced chemical reaction: H₂O₂(aq) + Cl₂O₇(aq) → ClO₂⁻(aq) + O₂(g).
Reduction half reaction: 6H⁺  + Cl₂O₇ → 2ClO₂⁻ + 3H₂O.
Oxidation half reaction: H₂O₂ → O₂ + 2H⁺ + 2e⁻ /×4; 4H₂O₂ → 4O₂ + 8H⁺ + 2e⁻
Sum: 6H⁺ + Cl₂O₇ + 4H₂O₂ → 4O₂ + 8H⁺ + 2ClO₂⁻ + 3H₂O;
Cl₂O₇ + 4H₂O₂ → 4O₂ + 2H⁺ + 2ClO₂⁻ + 3H₂O
Add 2 OH⁻: 2OH⁻ + Cl₂O₇ + 4H₂O₂ + → 4O₂ + 2ClO₂⁻ + 5H₂O.
Balanced chemical reaction: 4H₂O₂ + Cl₂O₇ + 2OH⁻→ 2ClO₂⁻ + 4O₂ +5H₂O.
The smallest possible integer coefficient of O₂ is 2.

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