Potassium crystallizes in a body centred cubic lattice . What is the approximate number of unit cells in 4.0 gm of potassium ? (Atomic mass of potassium =39)

Explanation

To find the approximate number of unit cells in 4.0 grams of potassium (K), which crystallizes in a body-centered cubic (BCC) lattice, we can follow these steps:

### Step 1: Determine the number of atoms in 4.0 grams of potassium.

1. **Find the number of moles in 4.0 grams of potassium:**
\[ \text{Number of moles} = \frac{\text{mass}}{\text{molar mass}} = \frac{4.0 \, \text{g}}{39 \, \text{g/mol}} \approx 0.1026 \, \text{mol} \]
...