# Problem: 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/molbond energy of O2 ΔHdiss = 498 kJ/molM(s) + ½ X2(g) → MX(s), ΔH°f = −635.09 kJ/mol

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###### FREE Expert Solution

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

Ca(s) + ½ O2(g)  CaO(s), ΔH˚f

82% (53 ratings)
###### Problem Details

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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Born Haber Cycle concept. You can view video lessons to learn Born Haber Cycle Or if you need more Born Haber Cycle practice, you can also practice Born Haber Cycle practice problems .

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