How can iron and sulfuric acid be obtained from pyrite FeS2? Write down the reaction equations.

1. 4FeS2 + 11O2 = 2Fe2O3 + 8SO2.
When pyrite reacts with oxygen, the result is iron oxide and sulfur oxide. Further, from the obtained compounds, we obtain iron and sulfuric acid.
2. Fe2O3 + 3C = 2Fe + 3CO.
When iron oxide and carbide interact, the result is iron and carbon monoxide.
3.2SO2 + O2 = 2SO3.
When tetravalent sulfur oxide interacts, hexavalent sulfur is formed as a result.
4. SO3 + H2O = H2SO4.
When sulfur oxide and water interact, the result is sulfuric acid.