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For a particular isomer of C8H18, the combustion reaction produces 5093.7 kJ of heat per mole of C8H18(g) consumed, under standard conditions. C8H18(g) + 25/2 O2(g) → 8 CO2(g) + 9 H2O(g) ΔH°rxn = -5093.7 kJ/mol What is the standard enthalpy of formation of this isomer of C8H18(g)? Standard enthalpy of formation values can be found in this table of thermodynamic values.