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Born–Haber Cycle Steps:
Sublimation of Mg(s) → Mg(g)→ +150 kJ/mol
1st Ionization: Mg(g) → Mg⁺(g)→ +735 kJ/mol
2nd Ionization: Mg⁺(g) → Mg²⁺(g) → +1445 kJ/mol
Bond dissociation: F₂ → 2 F atoms → +154 kJ/mol
Electron affinity: 2 F(g) → 2 F⁻(g) → 2 × (−328) = −656 kJ/mol
Lattice formation: Mg²⁺ + 2F⁻ → MgF₂(s) → −2913 kJ/mol
Total Enthalpy (ΔHf°):
Δ 𝐻 𝑓∘=
=(150+735+1445+154)−(656+2913)=2484−3569= −1085 kJ/mol
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