Lattice Energy (NaCl)

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Calculation of lattice energy of NaCl

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Lattice Energy (NaCl): 

Lattice Energy ( NaCl ) Na + (g) + Cl - (g) → NaCl (s) L.E Heat of formation : Na(s) + 1/2Cl 2 (g) → NaCl (s) Δ H f -410.9 kJ/mol 1:Reverse Δ H f : NaCl (s) → Na(s) + 1/2Cl 2 (g) Δ H f 410.9 kJ/mol 2: Δ H Vap : Na(s) → Na(g) Δ H Vap 107.6 kJ/mol 3:Remove 1e from Na : Na(g) → Na + (g) + 1e I.E 495.9 kJ/mol 4:Break Cl-Cl Bond: 1/2Cl 2 (g) → Cl (g) B.E 121.7 kJ/mol 5:Add 1e to Cl : Cl (g) + 1e → Cl - (g) E.A -349 kJ/mol ------------------------------------------------------------------------------------------- 6: Add eq 1 -5 NaCl (s) → Na + (g) + Cl - (g) Δ H 787 kJ/mol ------------------------------------------------------------------------------------------- Reverse eq 6 Na + (g) + Cl - (g) → NaCl (s) L.E -787 kJ/mol