How many moles of oxygen are produced by the decomposition of six moles of patassium chlorate?

How many moles of oxygen are produced by the decomposition of six moles of patassium chlorate?
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Answer :

Balanced equation: 2KClO3 --> 2KCl + 3O26 mol KClO3 = 3 x 2 mol KCl, so the number of moles O2 that can be produced by 6 mol KClO3 is:3 x 3 mol O2 = 9 mol O2.
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