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OBQ Practice Questions - Olimpíada Brasileira De Química Exam

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Use the Born-Haber cycle data to calculate the lattice energy (ΔH_lattice) of calcium fluoride, CaF2(s), defined as CaF2(s) -> Ca2+(g) + 2 F-(g). Given: ΔHf°[CaF2(s)] = -1228 kJ/mol; Sublimation enthalpy of Ca(s) = +178 kJ/mol; First ionization energy of Ca = +590 kJ/mol; Second ionization energy of Ca = +1145 kJ/mol; F-F bond dissociation energy = +158 kJ/mol (for F2 -> 2 F); Electron affinity of F(g) = -328 kJ/mol.
Correct Answer:
+2643 kJ/mol

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