Write expression for molar mass, M (in kg `mol^(-1)`) of a body-centred cubic crystal of an ionic compound if it has an edge length of 'a' metre and a density of 'd' kg `m^(-3)`

Explanation

To derive the expression for the molar mass \( M \) of a body-centered cubic (BCC) crystal of an ionic compound, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of BCC:**
In a body-centered cubic (BCC) structure, there are 2 atoms per unit cell. This is because there is one atom at each of the eight corners of the cube (each corner atom is shared among 8 unit cells) and one atom at the center of the cube.

2. **Identify the Volume of the Unit Cell:**
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