Use bond enthalpy values to determine the enthalpy change for the following reaction. State whether the reaction was endothermic or exothermic. Determine the molar enthalpy of combustion for C 3 H 8 (g) 2 C 3 H 8(g) + 10 O 2(g) → 6 CO 2(g) + 8 H 2 O (g)