Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3 — 2K2O + 2N2 + 5O2 to produce 56.6 kg of…

Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3 —> 2K2O + 2N2 + 5O2 to produce 56.6 kg of oxygen, how many moles of KNO3 must be heated? How many grams of KNO3 must be heated?