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-centred cubic (BCC) crystal of an ionic compound, we can follow these steps:

### Step 1: Understand the relationship between density, molar mass, and volume
The density \( d \) of a substance is defined as its mass per unit volume. For a crystalline solid, the density can be expressed as:
\[ d = \frac{Z \cdot M}{N_A \cdot V} \]
where:
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