Octane (C8H18) undergoes combustion according to the following thermochemical equation: 2C8H18(1) + 2502(g) 16CO2(g) + 18H20(1), DHrxn = -11,020 kJ/mol. Given that DHf[CO2(g)] = -393.5 kJ/mol and DH [H2O(1)] = -285.8 kJ/mol, calculate the standard enthalpy of formation of octane in kJ/mol