A compound AB has a cubic structure and molecular mass 99. Its density is `3*4 g cm^(-3)` . What is the length of the edge of the unit cell?

Explanation

To find the length of the edge of the unit cell for the compound AB with a cubic structure, we can use the formula that relates density, molar mass, and the edge length of the unit cell. Here’s the step-by-step solution:

### Step 1: Write down the formula for density
The formula for density (d) in terms of the molar mass (M), the number of formula units per unit cell (Z), and the edge length of the unit cell (a) is given by:

\[ d = \frac{Z \cdot M}{N_A \cdot a^3} \]
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