Problem: 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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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)