AgCl has the same structure as that of NaCl. The edge length of unit cell of AgCl is found to be 555 pm and the density of AgCl is 5.561 g `cm^(–3). Find the percentage of sites that are unoccupied.

Explanation

To solve the problem, we need to find the percentage of unoccupied sites in the unit cell of AgCl. Let's go through the steps systematically.

### Step 1: Understand the structure of AgCl
AgCl has the same structure as NaCl, which is a face-centered cubic (FCC) structure. In this structure:
- Chloride ions (Cl⁻) occupy the corners and face centers of the cube.
- Silver ions (Ag⁺) occupy the octahedral voids.

### Step 2: Determine the number of atoms in the unit cell
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