Iron occurs as bcc as well as fcc unit cell. If the effective radius of an atom of iron is 124 pm. Compute the density of iron in both these structures.

Explanation

To compute the density of iron in both BCC (Body-Centered Cubic) and FCC (Face-Centered Cubic) structures, we can follow these steps:

### Step 1: Identify the given data
- Effective radius of iron atom (r) = 124 pm = 124 x 10^-10 cm
- Atomic mass of iron (m) = 56 g/mol

### Step 2: Calculate the edge length (a) for BCC structure
In a BCC unit cell, the relationship between the edge length (a) and the atomic radius (r) is given by:
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