P4, White phosphorus, ignites in air to make light, heat, and P4O10 according to the P4(s) + 5O2(g) P4O10(s) reaction it is observed that when P4 of 67.2 grams is heated evolution of 1620 kJ of energy takes place calculate the molar enthalpy of combustion of Phosphorous when this combustion process was carried out under the constant pressure?