Using for the Coulomb constant

PHYSICS · Subjective · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance

Problem

Using

8.99\times10^9\,\text{N}\cdot\text{m}^2\cdot\text{C}^{-2}

for the Coulomb constant, calculate the electrostatic potential energy, in

\text{kJ}\,\text{mol}^{-1}

, for an isolated CaO ion pair separated by

1.95\times10^{-10}\,\text{m}

. (Charge on

\text{Ca}^{2+}

+2e

, on

\text{O}^{2-}

-2e

, where

e = 1.60\times10^{-19}\,\text{C}

; Avogadro’s number =

6.022\times10^{23}\,\text{mol}^{-1}