The ionization enthalpy of Na+ formation from Nag 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 .