Part C

The ionic compound CaO crystallizes with the same structure as sodium chloride

From the ionic radii given in the figure, calculate the potential energy of a single $Ca-O$ ion pair that is just touching

$e=1\mathrm{.}60{10}^{-19}C$

$=8\mathrm{.}99{10}^{9}J*\frac{m}{C^2}$

Express your answer in joules to three significant figures.

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Part D

Calculate the energy of a mole of such $Ca-O$ ion pairs.

Express your answer in kilojoules to three significant figures.

Express your answer in kilojoules to three significant figures.

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