The balanced chemical equation for the reaction of iron pyrite (FeS₂) with oxygen (O₂) to produce iron(III) oxide (Fe₂O₃) and sulfur dioxide (SO₂) is:

4 FeS₂ + 11 O₂ → 2 Fe₂O₃ + 8 SO₂

This reaction is called roasting.

Here's a breakdown of why:

* Roasting: This is a metallurgical process used to convert sulfide ores into oxides by heating them in the presence of air.

* Iron Pyrite: The mineral FeS₂ is commonly known as iron pyrite, also called "fool's gold" due to its metallic appearance.

* Oxidation: The reaction involves oxidation of both iron and sulfur. Iron goes from a +2 oxidation state in FeS₂ to a +3 oxidation state in Fe₂O₃, and sulfur goes from a -2 oxidation state in FeS₂ to a +4 oxidation state in SO₂.

This reaction is important in the extraction of iron from its ores. It is also a significant source of sulfur dioxide, which is a major air pollutant.