Is the synthesis of ozone, O3, from oxygen, O2, an example of an exothermic or endothermic reaction? Why?
(a) exothermic, because ultraviolet light is emitted during its formation
(b) endothermic, because ultraviolet light is emitted during its formation
(c) exothermic, because ultraviolet light is absorbed during its formation
(d) endothermic, because ultraviolet light is absorbed during its formation
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