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how do I calculate the mass of the oxygen produced by the decomposition reaction of KClO3 to yield KCl and O2 using MnO2 as a catalyst?

how do I calculate the mass of the oxygen produced by the decomposition reaction of KClO3 to yield KCl and O2 using MnO2 as a catalyst? The mass of the water displaced by the gas is 95.035grams, but I am not sure if I should be using stoichiometry to solve or the combined gas law equation P1V1/T1=P2V2/T2

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