Recall that lattice energy is the energy required to combine two gaseous ions into a solid ionic compound:
Ca2+(g) + O2–(g) → CaO(s)
To calculate for lattice energy, we need to do the Born-Haber cycle for CaO.
We start with the corresponding formation equation for CaO:
Ca(s) + ½ O2(g) → CaO(s), ΔH˚f
Use the Born-Haber cycle to calculate the lattice energy of CaO. You may need the following data:
electron affinity of oxygen EA1 = −141 kJ/mol, EA2 = 744 kJ/mol
ionization energy of calcium IE1 = 590 kJ/mol, IE2 = 1145 kJ/mol
the enthalpy of sublimation for calcium ΔHsub = 178kJ/mol
bond energy of O2 ΔHdiss = 498 kJ/mol
M(s) + ½ X2(g) → MX(s), ΔH°f = −635.09 kJ/mol
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