White phosphorus, P4, ignites in air to produce heat, light, and P4O10 according to the following reaction.
P4(s) + 5O2(g) P4O10(s)
If 67.2 g of P4 is burned, 1620 kJ of energy is evolved. What is the molar enthalpy of combustion of P4 if the process was carried out under constant pressure?