S-H2S-SO2-SO3-H2SO4-BaSO4

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The reactions involved in the conversion of hydrogen sulfide (H2S) to sulfuric acid (H2SO4) via sulfur dioxide (SO2) and sulfur trioxide (SO3) are as follows:

H2S reacts with oxygen (O2) to form sulfur dioxide (SO2) and water (H2O)
2H2S + 3O2 → 2SO2 + 2H2O

Sulfur dioxide (SO2) is further oxidized to form sulfur trioxide (SO3) in the presence of oxygen (O2)
2SO2 + O2 → 2SO3

Sulfur trioxide (SO3) reacts with water (H2O) to form sulfuric acid (H2SO4)
SO3 + H2O → H2SO4

In industrial processes, the conversion of hydrogen sulfide to sulfuric acid is typically carried out in multiple steps using various catalysts and conditions to optimize the process efficiency and yield.

The formation of barium sulfate (BaSO4) can occur as a byproduct in certain reactions involving sulfur compounds. Barium sulfate is insoluble in water and is often used in analytical chemistry as a contrast agent in X-ray imaging or as a filler in plastics and paints.