FeS2–SO2–SO3–H2SO4–SO2

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This is a simplified representation of the chemical transformation involving the compound FeS2 (Iron pyrite) reacting with oxygen to form sulfur dioxide (SO2), which further oxidizes to sulfur trioxide (SO3) and eventually forms sulfuric acid (H2SO4) through hydration. The initial reaction can be written as:

4FeS2 + 11O2 → 2Fe2O3 + 8SO2

The sulfur dioxide can then react with oxygen to form sulfur trioxide:

2SO2 + O2 → 2SO3

Lastly, the sulfur trioxide can react with water to form sulfuric acid:

SO3 + H2O → H2SO4

This series of reactions depicts the overall conversion of iron pyrite to sulfuric acid through the intermediate formation of sulfur dioxide and sulfur trioxide.