The equation KMnO4 equals K2O plus MnO plus O2 is not balanced. The correct balanced equation is:

2KMnO4 --> K2O + MnO2 + O2

In this equation, two moles of potassium permanganate (KMnO4) decompose to form one mole of potassium oxide (K2O), one mole of manganese dioxide (MnO2), and three moles of oxygen gas (O2).