NaNO³ = NaNO² + O²

I'm sorry, but the chemical reaction you provided is incorrect. The correct balanced equation for the reaction between NaNO3 and O2 is:

2 NaNO3 (s) → 2 NaNO2 (s) + O2 (g)

In this reaction, solid sodium nitrate (NaNO3) reacts to give solid sodium nitrite (NaNO2) and gaseous oxygen (O2).