plz tell me what is this poac method... & how to use it

Principle of atom conservation (POAC) :
This principle is based on the conservation of mole of atom or mass of atom or number of atom. This method does not depend on the stochiometric coefficient. Balancing of equations are not required for this method.
For example:
KClO3→ KCl + O2
a) Firstly , we will do the conservation of K atom :
Total mol of K atom in KClO3 is equal to the total mol of K atom in KCl
1×number of mol of KClO3= 1×number of mol of KCl
b) Now , we will do the conservation of Cl atom:
Total mol of Cl in KClO3is equal to the total mol of Cl in KCl
1×number of mol of KClO3= 1×number of mol of KCl
c) Conservation of oxygen atom :
Total mol of oxygen atom in KClO3is equal to the total mol of oxygen atom in O2
3×number of mol of KClO3= 2×number of mol of O2
This principle can be explained with an example :
If we have to calculate the weight of O2produced when 12.25 g of KClO3is heated.
Then , according to this method conservation of oxygen atom will be :
3×number of mol of KClO3= 2×number of mol of O2
3×12.2512.25= 2×weightofO232
Weight of O2= 4.8 g

Think of it this way... No. Of moles of oxygen must be same on both sides.One mole of KClO3 has 3 moles of oxygenOne mole of O2 has 2 moles so total moles of oxygen on RHS =3×moles of KClO3 No. Of moles on LHS= 2× moles of O2