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Question
How is dioxygen prepared in the laboratory from KClO3?
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Solution
Dioxygen is prepared by heating potassium chlorate (KClO3) in the presence of the catalyst, MnO2.
\[\ce{\underset{Potassium chlorate}{2KClO_{3(s)}} ->[Heat][MnO2] 2KCl_{(s)} + \underset{Dioxygen}{3O_{2(g)}}}\]
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