Potassium chlorate decompose to form potassium chloride and oxygen, according to the following reaction:
= 2KCl + 3O2
It is shown that from 2 mol of potassium chlorate we can obtain 3 mol of oxygen, so from 1 mol of potassium chlorate we will obtain 1.5 mol of oxigen. It is well known fact, that in 1 mole of pure substance there are 6.023·1023
molecules, so 1.5 mol of oxigen contain 9.035·1023
molecules of oxygen.