The figure is the plot potential energy versus internuclear distance (d) of `H_2` molecule in the electronic ground state. What is the value of the net potential energy `E_0` (as indicated in the figure) in kJ `mol^(-1)` , for `d=d_0` at which the electron repulsion and the nucleus - nucleus repulsion energies are absent ? As reference , the potential energy of H atom is taken as zero when its electron and the nucleus are infinitely far apart.
use Avogadro as `6.023xx10^(23) "mol"^(-1)`.

Answer

5246.5

Explanation

For one H atom
`P.E. = (kq_1q_2)/r=(9xx10^9xx[1.6xx10^(-19)]^2)/(0.529xx10^(-10))`
`=(9xx1.6xx1.6)/(0.529)xx10^(-9)`
Total potential energy for 2 - H - atom (per mole)
`=(2xx9xx1.6xx1.6)/(0.529)xx10^(-19)xx6xx10^(23)`
`=5246.5` KJ/mole