Born Haber Cycle

Combustion

Formation

Lattice breaking

Ionisation

Na(g) ---> Na⁺(g) + e^- ΔH = -364 kJmol^-1

C₂H₅OH (l) + 3O₂ (g) ---> 2 CO₂(g) + 3H₂O (l) ΔH = - 1286 kJmol^-1

2C (s) + 2H₂ (g) ---> C₂H₄ (g) ΔH = - 52.3 kJmol^-1

Na⁺(g) ---> Na⁺(aq) ΔH = - 364 kJmol^-1

Lattice breaking

Atomisation

Ionisation

Formation

Ionisation

Combustion

Formation

Hydration

Ionisation

Combustion

Formation

Atomisation

½ I₂ (s) → I (g)

I₂ (s) → 2I (g)

½ I₂ (g) → I (g)

I₂ (g) → 2I (g)

exothermic, endothermic.

exothermic, exothermic.

endothermic, endothermic.

endothermic, exothermic.

Enthalpy of formation

Enthalpy lattice of formation

Electron affinity of bromine

Enthalpy of atomisation of zinc

Formation

1^st ionisation energy of Na

1^st electron affinity of Na

Atomisation of Na

Enthalpy of formation calcium bromide

Enthalpy of atomisation of calcium

1^st electron affinity of bromine

Enthalpy of atomisation of bromine

+695kJ/mol

-695kJ/mol

-635kJ/mol

-635kJ/mol