The ionization enthalpy of Na+ formation from Na(g) is 495.8 kJ mol⁻¹, while the electron gain enthalpy of Br is –325.0 kJ mol⁻¹. Given the lattice enthalpy of NaBr is –728.4 kJ mol⁻¹. The energy for the formation of NaBr ionic solid is (–) ...... × 10⁻¹ kJ mol⁻¹
