One mole of `He^(o+)` ions is excited. An anaylsis showed that `50%` of ions are in the third energy level `25%` are in the second energy level and the remaining are in the first energy level. Calculate the energy emitted in kilojoules when all the ions return to the ground state.

Answer

`331.13xx10^(4)J`

Explanation

Number of atom in `3^(rd)` orbit `=0.5N_(A)`
Number of atom in `2^(nd)` orbit `=0.25N_(A)`
Total energy evolve `=0.5N_(A)(E_(3)-E_(1))+0.25N_(A)(E_(2)-E_(1))`