7. The lattice energy is defined as the energy required to break one mole of an ionic solid into its ions in the gas phase. The lattice energy for calcium oxide corresponds to the following reaction. CaO(s) → Ca2-(g) + O²(g) AH = ? Using the following information, determine the lattice energy for calcium oxide. AH = 178.2 kJ AH = 1747.9 kJ 1. Ca(s) → Ca(g) 2. Ca(g) → Ca²•(g) + 2e- 3. Oz(g) → 20(g) 4. 02 (g) → O(g) + 2e 5. Ca(s) + 2 O2(g) → CaO(s) AH = -635.0 kJ AH = 498.3 kJ AH = -702 kJ

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