Why would the decomposition of hydrogen peroxide take place faster when manganese dioxide is present than when it is absent? How much manganese dioxide would you expect to find present after the reaction?
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Manganese dioxide catalyzes the decomposition of hydrogen peroxide to oxygen and water. Since manganese dioxide is a catalyst, it is not consumed in the reaction. Normally the activation energy for this uncatalyzed reaction is around 75 KJ/mole (Moelwyn-Hughes).
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