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.
Ozone is a gas that is naturally present in our atmosphere. Ozone has the chemical formula O3 because an ozone molecule contains three oxygen atoms. Ozone was discovered in laboratory experiments in the mid- 1800s.