If the enthalpy of sublimation of Li is 155 ~kJ ~mol ⁻¹ , enthalpy of dissociation of F ₂ is 150 ~kJ ~mol ⁻¹ , ionization enthalpy of Li is 520 ~kJ ~mol ⁻¹ , electron gain enthalpy of F is -313 ~kJ ~mol ⁻¹ , standard enthalpy of formation of LiF is -594 ~kJ ~mol ⁻¹ . The magnitude of lattice enthalpy of LiF is _ _ _ _ kJ mol ⁻¹ . (Nearest Integer)