How many moles of O in KNO3

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Really simple question.... that I don't get very well.

How many moles of Oxygen ions are in each mole of KNO3?

Would it be 3?

Yes. The cofficient of KNO3 as a whole is 1 while there are three O so the ratio is 1:3. So for every 1 mole of KNO3, there are 3 moles of oxygen.
 
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