Question

write a balanced equation for potassium nitrate---------potassium nitrite + oxygen

Answer 1

First of all
Potassium nitrite = KNO2
Oxygen =O2
So,
potassium nitrite + oxygen = potassium nitrate (KNO3) .

Balanced equation :

*2KNO2 + O2 = 2KNO3.*

Hope it helps .
Thank You.

Answer 2

K4NO3--------------K3NO4+O2