Calculate the energy required for promotion of electrons from the 1st to 5th Bohr orbit of all the atoms present in 1 mole of H-atoms.

Explanation

Electronic energy in the n-th orbit of H-atom.
`E_(n)=(1312)/n^(2) kJ*mol^(-1)`
`therefore`Total energy required
`=(E_(5)-E_(1))=-(1312)/(5^(2))-(-(1312)/(1^(2)))=1259.52kJ*mol^(-1)`.