There are different possible answers here; in fact several of them. The two most obvious ones are:
S + O2 --> SO2 : SO2 + H2O --> H2SO3
and:
2 S + 3 O2 --> 2 SO3 : 2 SO3 + 2 H2O --> 2 H2SO4
That just shows the balance; it does not point out whether the reaction requires several steps or special catalysts etc. For example, the second reaction might need a catalyst like platinum or vanadium pentoxide, or it could take a different course like:
2S +2O2 --> 2SO2 : 2SO2 + 2H2O --> 2H2SO3 : 2 H2SO3 + O2 --> 2 H2SO4
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The balanced equation for the redox reaction between copper and sulfuric acid to form copper(II) sulfate, sulfur dioxide, and water is: 2Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
When aqueous potassium hydroxide is reacted with sulfur dioxide, potassium sulfite (K2SO3) and water are produced. The balanced chemical equation for the reaction is: 2KOH + SO2 → K2SO3 + H2O.
The chemical equation for the reaction between sulfur dioxide (SO2), bromine (Br2), and water (H2O) is: SO2 + Br2 + 2H2O -> H2SO4 + 2HBr
The balanced chemical equation for this reaction is: 2 H2S + 3 O2 -> 2 H2O + 2 SO2
The balanced equation for the reaction is: 2CH3CHO + 3O2 -> 2CO2 + 2H2O