Calculate the ratio of lattice energies of `CaCl_(2(s))` and `NaCl_((s))`, if the inter-ionic distance in `CaCl_(2)` is twice that of `NaCl_((s))`.

Explanation

To calculate the ratio of lattice energies of `CaCl2(s)` and `NaCl(s)`, we will follow these steps:

### Step 1: Understand the Lattice Energy Formula
Lattice energy (U) is proportional to the product of the charges of the ions divided by the distance between them. The formula can be expressed as:
\[ U \propto \frac{z_1 \cdot z_2}{r} \]
where \( z_1 \) and \( z_2 \) are the charges of the cation and anion, respectively, and \( r \) is the inter-ionic distance.

### Step 2: Identify the Charges and Distances
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