The crystal AB (rock salt structure) has molecular weight 6.023 y u, where y is an arbitrary number in u. If the minimum distance between cation and anion is `y^(1//2)` nm and the observed density is 20kg/`m^(3)`, find the (i) density in kg/`m^(3)` and (ii) type of defect.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Understand the Given Information
- Molecular weight of the crystal AB = \(6.023y \, u\)
- Minimum distance between cation and anion = \(y^{1/2} \, nm\)
- Observed density = \(20 \, kg/m^3\)

### Step 2: Determine the Number of Formula Units per Unit Cell (Z)
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