Answer:
0.143 nm
Explanation:
The Coulomb potential energy between two charged particles can be found with:
[tex]\large \text{$ U=\ $} \LARGE \text{$ \frac{1}{4\pi \epsilon_0}\frac{q_1 q_2}{r} $}[/tex]
where
Plug in values and solve for the distance r.
[tex]\large \text{$ U=\ $} \LARGE \text{$ \frac{1}{4\pi \epsilon_0}\frac{q_1 q_2}{r} $}\\\\\large \text{$ 970\frac{kJ}{mol}\times\frac{1\ mol}{6.02\times 10^{23}}\times\frac{1000 J}{kJ} =\ $} \LARGE \text{$ \frac{1}{4\pi \times (8.854\times10^{-12}\ C^2/J/m)}\frac{(1.602\times 10^{-19}\ C)^2}{r} $}\\\\\large \text{$ 1.611\times 10^{-18} J=\ $} \LARGE \text{$ \frac{2.307\times 10^{-28} Jm}{r} $}\\\\\large \text{$ r=1.43\times10^{-10}\ m $}\\\\\large \text{$ r=0.143\ nm $}[/tex]
Rounded to three significant figures, the distance between the ions is 0.143 nanometers.
