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Calculate the lattice energy of Na2O for the following data:

Ionization energy of Na(g):::495kj/mol

Electron affenity of O(g) for 2e-:::603 kj/mol

Energy to vaporize Na(s):::109 kj/mol

O2(g) bond energy:::499 kj/mol

Energy change for the reaction 2 Na(s) + 1/2 O2(g)---->Na2O(s)

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