An alloy of copper and zinc solidifies in ccp structure, where copper occupies lattice points and zinc occupies 50% of the tetrahedral voids and all octahedral voids. Calculate the weight percentage of copper in the alloy.

Explanation

To calculate the weight percentage of copper in the alloy of copper and zinc that solidifies in a cubic close-packed (ccp) structure, we will follow these steps:

### Step 1: Determine the number of copper atoms in the unit cell.
In a ccp structure, the number of atoms (Z) can be calculated using the contributions from the corners and the faces of the cube.

- **Contribution from corners**: There are 8 corners in a cube, and each corner contributes \( \frac{1}{8} \) of an atom.
\[
\text{Contribution from corners} = 8 \times \frac{1}{8} = 1 \text{ atom}
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