6 The Born-Haber Cycle - Standard enthalpy of atomisation...

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The Born-Haber Cycle
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The Born-Haber cycle is a special case of Hess’s law applied to ionic crystals only. Definitions Standard enthalpy of sublimation is the heat absorbed when one mole of atoms are vaporised Standard enthalpy of bond dissociation is the energy absorbed when one mole of bonds is broken The electron affinity is the energy absorbed when one mole of ions are formed from one mole of atoms The standard lattice energy is the energy absorbed when one mole of ionic crystals is formed.
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Unformatted text preview: Standard enthalpy of atomisation is the energy absorbed when one mole of atoms are formed-411 = 109 + 121 + 449 364 + H l Where H l = standard lattice energy of NaCl = -726 KJ/mol For MgCl 2 we will need 2 x EA for 2 atoms of Cl Be careful to note if bond dissociation energy (BDE) is given or atomisation energy for chlorine or other diatomic gas e.g. BDE for chlorine is 242 KJ/mol H a for chlorine is half this value 121 KJ/mol...
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6 The Born-Haber Cycle - Standard enthalpy of atomisation...

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