Two sets A and B are disjoint if they have no elements in common (their intersection is the null set).
show more Ozone, O3(g), is a form of elemental oxygen that is important in the absorption of ultraviolet radiation in the stratosphere. It decomposes to O2(g) at room temperature and pressure according to the following reaction: 2O3(g)>3O2(g) (Delta)H = -284.6 kJ.
The process begins with UV radiation breaking apart molecular oxygen (O 2), thus producing two oxygen (O) atoms. In the second step, an oxygen atom (O) recombines with an oxygen molecule (O 2) to form an ozone (O 3) molecule.