[Raafiq]

I can't seem to figure this one out.

What is the molar ratio between KClO3 and O2 in KClO3? There are 0.01243 moles of KClO3 and 0.01721 moles of O2. I thought the method is to just divide the two, but the answer is somehow 3:2. Can someone explain how they obtained this answer?

[plankk]

The molar ratio between KClO₃ and O₂ in KClO₃ means to calculate how many molecules of O₂ are in one molecule of KClO₃. So one molecule of potassium chlorate consists 3 atoms of oxygen. 3 atoms of oxygen can build up 3:2 molecules of oxygen. And this is the seeking value.