Use the BornHaber cycle and Table 10.3 to calculate the lattice energy of CaO. (H sub for

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Use the Born–Haber cycle and Table 10.3 to calculate the lattice energy of CaO. (ΔHsub for calcium is 178 kJ/mol; IE1 and IE2 for calcium are 590 kJ/mol and 1145 kJ/mol, respectively; EA1 and EA2 for O are -141 kJ/mol and 744 kJ/mol, respectively.)TABLE 10.3 Average Bond Energies Bond Energy (kJ/mol) 436 414 389 464 368 565 431 364 297 347 611 837 305 615

The Born-Haber Cycle The Born-Haber cycle is a hypothetical series of steps that represents the formation of

As gaseous ions coalesce... -Na+ -cr ... heat is emitted. Nat (g) + Cl (g) NaCl(s) AH = lattice energy A

Now consider the following set of steps-the Born-Haber cycle-from which NaCl (s) can also be made from Na(s)

Enthalpy, H 3 lonization of gaseous sodium AH Na(g) + Cl(g) Formation of gaseous sodium from solid sodium

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