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Al ( s ) + 3/2 Br 2 ( l )

Al 3+ (g) + 3 Br (g). 3 x E.A. = 3 x -324.6 kJ/mol = -973.8 kJ/mol. I.E. 3 = 2744.8 kJ/mol I.E. 2 = 1816.7 kJ/mol I.E. 1 = 577.5 kJ/mol. Al 3+ (g) + 3 Br - (g). Al (g) + 3 Br (g). LATTICE ENERGY = -5331.1 kJ/mol. 3/2 x Bond Energy = 3/2 x 192.8 kJ/mol = 289.2 kJ/mol.

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Al ( s ) + 3/2 Br 2 ( l )

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  1. Al 3+(g) + 3 Br (g) 3 x E.A. = 3 x -324.6 kJ/mol = -973.8 kJ/mol I.E.3 = 2744.8 kJ/mol I.E.2 = 1816.7 kJ/mol I.E.1 = 577.5 kJ/mol Al 3+(g) + 3 Br -(g) Al (g) + 3 Br (g) LATTICE ENERGY = -5331.1 kJ/mol 3/2 x Bond Energy = 3/2 x 192.8 kJ/mol = 289.2 kJ/mol Al (g) + 3/2 Br2(g) 3/2 x ΔHvap = 3/2 x 30.5 kJ/mol = 45.8 kJ/mol Al (g) + 3/2 Br2 (l) ΔHfus + ΔHvap = 303.7 kJ/mol Al (s) + 3/2 Br2 (l) ΔHformation= -527.2 kJ/mol AlBr3 AlBr3 (s) The Born-Haber Cycle - AlBr3

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