The following enthalpy data apply at 298 K (values in kJ mol⁻¹).
Sublimation of Na(s): +108
Ionization of Na(g): +496
1⁄2 Cl_2(g) → Cl(g): +122
Cl(g) + e⁻ → Cl⁻(g): –349
Formation of NaCl(s) from its elements: –411
Using these data, what is the lattice enthalpy ΔH for
Na⁺(g) + Cl⁻(g) → NaCl(s) ?
a) +788
b) −910
c) −788
d) −1137