The total energy for the hydrogen molecule is -1.1789737 Hartrees. what is the binding energy ( in KJ/mol ) of the molecule ? Solution Eb =Et-E0 whr Et = total energy of H2 molecule which is -32.08ev and E0 = ground state energy of hydrogen molecuel which is -1.17ev hence Eb= -32.08+1.17 = -30.31ev = -4.84 *10^-21 kJ as 1ev = 1.6* 106-22kj and 1 hartree = 27.2107 ev.