[填空题]
Estimate the binding anz8gah3.5qq energy of a KCl molecule by calculating the el(vhyoeid9-1 loa m(( tectrostatic potential energy w 1((hio(o-yvd ltaem 9hen the $ \text{K}^+ $ and $ \text{Cl}^- $ ions are at their stable separation of 0.28 nm. Assume each has a charge of magnitude $ 1.0e $. Binding energy = eV