Galicia PAU Chemistry Química 2o Bachillerato CIUG Practice Questions - Galicia PAU Chemistry Química 2o Bachillerato CIUG 2026 (Probas D'Acceso á Universidade) Exam

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Given standard enthalpies for NaCl formation: Sublimation of Na(s) = +107 kJ/mol, 1st Ionization Energy of Na(g) = +496 kJ/mol, Bond dissociation of Cl₂(g) = +244 kJ/mol, Electron affinity of Cl(g) = -349 kJ/mol, and Standard enthalpy of formation ΔH°f(NaCl, s) = -411 kJ/mol. Calculate the lattice enthalpy (ΔH_lattice) for NaCl(s) → Na⁺(g) + Cl⁻(g).

+787 kJ/mol +665 kJ/mol +388 kJ/mol +909 kJ/mol

Correct Answer:

+787 kJ/mol

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