How many moles of kclo3 reacted if 9 moles of o2 were produced in this reaction: 2kclo3 → 2kcl + 3o2

2 mol KClO₃ - 3 mol O₂
x mol KClO₃ - 9 mol O₂

x=9*2/3= 6 mol

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Sorry i dont understand the question can you rephase it?