The chemical equation for the decomposition of nitrogen dioxide (NO₂) into oxygen gas (O₂) and nitrogen gas (N₂) is:

2 NO₂ → O₂ + N₂

Here's what the equation tells us:

* 2 NO₂: Two molecules of nitrogen dioxide are the reactants.

* O₂: One molecule of oxygen gas is a product.

* N₂: One molecule of nitrogen gas is a product.

This reaction is a decomposition reaction where one compound breaks down into two or more simpler substances.