CaO and NaCl have the same crystal structure and nearly the same ionic radii.If 'u' is the lattice energy of NaCl,then what is the lattice energy of CaO?

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Solution

In calculation of lattice energy , the charges on anion is very important parameter and it comes in multiplication term.
So in NaCl the charges are +1 and -1. The product value of the charges is 1.
But in CaO the charges are +2 and -2. The product value is 4. So the lattice energy of CaO would be 4 times of NaCl with same data.

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