Since a stable molecule, namely sulfur trioxide, S03, can be produced from this radical by the removal of the hydrogen atom, the reaction principles predict that the next reaction in the sequence is that between the radical and an 07 molecule to abstract Ht o o


The sulfur trioxide molecule rapidly combines with a gaseous water molecule to form sulfuric acid. Finally, the H2S04 molecules react with water, whether in the form of water vapor or as a mist, to form an aerosol of droplets, each of which is an aqueous solution of sulfuric acid. The sequence of steps from gaseous S02 to aqueous H2S04 is

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