A chemist creates a reaction between nitrogen and oxygen to form nitrogen monoxide. This reaction is shown by the equation N2(g) + O2(g) ⟶ 2NO(g). The time interval of this reaction is t1 = 12 seconds to t2 = 22 seconds. During this reaction, the O2 concentration changes from 0.237 mol/L to 0.207 mol/L.

What is the average reaction rate for O2 in this reaction?