How do you calculate the ionization energy (in kJ/mol) of the He+ ion?

Helium is having two unit charges in the nucleus.

A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by

E=-(2.18×10-18J) (Z2) (1/n2)

n is the principle of quantum number

Z is the atom number of the element

I.E = 8.72×10−21×6.02×1023 = 5250xkJ/mol

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