The conversion of gaseous atoms `K` and `F` to `K^(o+)` and `F^(ɵ)` absorbs `0.85 eV` of energy. If the `IE` and `Delta_("eg")H^(ɵ)` of `K` and `F` have magnitudes in the ratio of `7:6`, what is the electron gain enthalpy `(Delta_("eg")H^(ɵ))` of fluorine ?

Explanation

Let `IE = xeV`
`E_(A) = yeV`
`:. X -y = 0.85 eV (EA` is exothermic)
`:. x//y = 7//6`
Solved for `x` and `y rArr y = 5.10 eV`