Potassium chlorate, KClO3, decomposes upon slight heating in the presence of a catalyst according to the reaction below:   2KClO3 (s) -> 2KCl (s) + 3O2(g)   In a certain experiment, 40.0 g KClO3 is heated until it completely decomposes. The experiment is performed and the oxygen gas is collected and its mass is found to be 5.1 g. What is the percent yield?

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