A test tube weighs 10.72g when it is empty, and 13.22g with the potassium chlorate/potassium chloride mixture placed in it. After heaating the test tube until a glowing splint does not re-ignite, the test tube weighs 12.93g.

I need to know:
How many moles of oxygen were produced?
How many moles of potassium chlorate exist?

Potassium chlorate-KClO3
Potassium chloride-KCl

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