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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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