Heat of Decomposition of Potassium Perchlorate

The heat of decomposition of potassium perchlorate into potassium chloride and oxygen has been determined in a bomb calorimeter. The process may be represented by the equation: KClO4(c)=KCl(c)+2O2(g),ΔH°(25°C)=−4.02±0.34kj/mole,=−0.96±0.08kcal/mole.Combination of this datum with the heat of formation of KCl(c) gives −103.22 ±0.15 kcal/mole for the standard heat of formation of KClO₄(c) at 25 °C.