Calculate the energy required for the process
` He^(+)(g) to He^(2+) (g) + e^(-)`
The ionization energy for the H atom in the ground state is `2.18xx10^(-18) J "atom" ^(-1)`

Answer

A

Explanation

`E_(1)` of H atom `= - IE = - 2.18 xx 10^(-18) J`
`E_(1)` of H^(o+) = `E_(1)(H) xx Z^(2) = - 2.18 xx 10^(-18) xx 2^(2)J`
`=8.72 xx 10^(-18) J`
The given process represents ionisation of `He^(o+)`
The energy required for ionisation of `He^(o+) = - E_(1) (He) = 8.72 xx 10^(-18) J`