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Answer:
640.32 g
Explanation:
2KClO₃ → 2KCl + 3O₂
First we convert KClO₃ moles to O₂ moles, using the stoichiometric coefficients:
Then we convert O₂ moles to grams, using its molar mass:
So 640.32 g of O₂ are formed from 13.34 moles of KClO₃.