Step-by-step explanation:
2KClO3 → 2KCl + 3O2
2 mol KClO3 / 3 mol O2 = 4.2 mol KClO3 / x mol O2
x = (3 mol O2)(4.2 mol KClO3) / (2 mol KClO3) = 6.3 mol O2
6.3 moles of oxygen are produced by the decomposition of 4.2 moles of potassium chlorate.
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