Ozone is an allotropic form of oxygen. Its molecular formula is O3 and molar mass is 48 g mol-1. Schonbein (1840) concluded that Van Marums observations in 1785 of a peculiar smell, when an electric discharge was passed through oxygen (or air), was in fact a new gas. He named it Ozone, which is derived from a Greek word ozoaterr meaning smell. Soret in 1860, assigned the molecular formula O3.The occurrence of ozone is in small amounts, in the upper layer of the atmosphere, where it is formed due to the action of ultraviolet rays on the oxygen of the air. It is also present in seawater where it is formed due to the reaction of fluorine with water.
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