Answer 1

Energy associated with hydrogen-like species is given by,

`E_n = -2.18 xx 10^(-18)  (Z^2/n^2)J`

For ground state of hydrogen atom,

`triangleE = E_prop - E_1`

`= 0 - [-2.18 xx 10^(-18)  {(1)^2/(1)^2}]J`

`triangleE =2.18 xx 10^(-18) J`

For the given process,

`He_(" "(g))^+ -> He_(" "(g))^(2+) + e^(-)`

An electron is removed from n = 1 to n = ∞.

`triangleE = E_prop - E_1`

`= 0-[-2.18 xx 10^(-18) {(2)^2/(1)^2}]`

`triangleE = 8.72 xx 10^(-18) J`

∴ The energy required for the process is `8.72 xx 10^(-18)J`