Write the reaction that defines the bond energy of O2. Is this process endothermic or exothermic? How many moles of bonds did you break? How many moles of separated oxygen atoms did you obtain? 8. Balance the reaction in 7 so that you will obtain 3 moles of separated oxygen atoms. How many moles of 02 did you use? 9. If the enthalpy of the reaction that you wrote in 7 is +400kJ, what will be the enthalpy value of the reaction you wrote in 8? 10. Write the reaction that defines the lattice energy of aluminum oxide.