For a particular isomer of C8H18, the following reaction produces 5104.1 kj of heat per mole of C8H18(g) consumed, under standard conditions
C8H18(g) + 25/2O2(g) --->8CO2(g) + 9H2O(g)
deltaHrxn=-5104.1 kj
What is the standard enthalpy of formation of this isomer of C8H18(g)?