The lattice enthalpy of calcium oxide is the energy change for the reaction
1. CaO(s) → Ca(g) + ½ O2(g)
2. Ca(g) + ½ O2(g) → CaO(s)
3. Ca(g) + O(g) → CaO(g)
4. CaO(s) → Ca2+(g) + O2- (g)
5. CaO(s) → Ca(g) + O(g)
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