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Born-Haber Cycle
AP Chemistry · Unit 6 Thermochemistry
Learning Objectives
Apply Hess's law to calculate lattice energy
Identify each step: sublimation, ionization, dissociation, electron affinity
Understand lattice energy trends (charge, size)
Calculate ΔHf from cycle components
Hess's Law
ΔH
f
= ΔH
sub
+ IE + ½ΔH
diss
+ EA + U
lattice
U
lattice
= ΔH
f
− (ΔH
sub
+ IE + ½ΔH
diss
+ EA)
Lattice energy ∝ (q⁺ × q⁻) / (r⁺ + r⁻)
Tags
Born-Haber
lattice energy
Hess's law
ionic bonding
Select Compound
NaCl — Sodium Chloride
KBr — Potassium Bromide
MgO — Magnesium Oxide
CaF₂ — Calcium Fluoride