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O3 should have a higher boiling point because the bond between oxygen-oxygen is stronger than the bond between oxygen and sulfur. This is because the oxygen molecule has a smaller diameter than the sulfur atom due to having one less shell of electrons. This allows the bonding electrons to revolve closer to the nuclei of the oxygen atoms versus the nucleus of the sulfur atom.
I think SO2 would have a higher boiling point because it has more electrons than O3, therefore making it more polarizable. Since it is more polarizable, it has stronger van der waals forces, which take more energy to break, causing SO2 to have a higher boiling point.
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