Calculate the mass percentage composition of copper pyrites (`CuFeS_2`).

Explanation

To calculate the mass percentage composition of copper pyrites (CuFeS₂), we will follow these steps:

### Step 1: Determine the molar mass of CuFeS₂
- **Copper (Cu)**: 1 atom × 63.5 g/mol = 63.5 g/mol
- **Iron (Fe)**: 1 atom × 55.8 g/mol = 55.8 g/mol
- **Sulfur (S)**: 2 atoms × 32.0 g/mol = 64.0 g/mol

Now, we can calculate the total molar mass of CuFeS₂:
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