Calculate the value of Avogadro's number from the following data:
Density of `NaCl = 2.165 g cm^(-3)`
Distance between `Na^(o+)` and `Cl^(Θ)` in `NaCl = 281` pm

Explanation

To calculate Avogadro's number using the given data, we will follow these steps:

### Step 1: Understand the Crystal Structure of NaCl
NaCl crystallizes in a face-centered cubic (FCC) structure. In this structure:
- Each unit cell contains 4 NaCl formula units.
- Na+ ions occupy the octahedral voids, while Cl- ions are located at the corners and face centers of the unit cell.

### Step 2: Calculate the Edge Length (a) of the Unit Cell
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