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To solve this problem, we need to determine the mass of each metal (Cuivre, Étain, Zinc, and Plomb) that composes a bronze alloy with a total mass of 79.5 kg, given the percentage composition of each metal. 

The composition of the bronze alloy is as follows:
- A (Cuivre/Copper) = 81%
- B (Étain/Tin) = 6.5%
- C (Zinc) = 7.25%
- D (Plomb/Lead) = 5.25%

To find the mass of each metal, we will multiply the total mass of the alloy by the percentage of each metal, converting the percentage into a decimal. 

### Step-by-step solution:
1. **Mass of Copper (Cuivre)**:
   \[
   \text{Mass of Copper} = 79.5 \, \text{kg} \times \frac{81}{100} = 79.5 \, \text{kg} \times 0.81 = 64.395 \, \text{kg}
   \]

2. **Mass of Tin (Étain)**:
   \[
   \text{Mass of Tin} = 79.5 \, \text{kg} \times \frac{6.5}{100} = 79.5 \, \text{kg} \times 0.065 = 5.1675 \, \text{kg}
   \]

3. **Mass of Zinc**:
   \[
   \text{Mass of Zinc} = 79.5 \, \text{kg} \times \frac{7.25}{100} = 79.5 \, \text{kg} \times 0.0725 = 5.76375 \, \text{kg}
   \]

4. **Mass of Lead (Plomb)**:
   \[
   \text{Mass of Lead} = 79.5 \, \text{kg} \times \frac{5.25}{100} = 79.5 \, \text{kg} \times 0.0525 = 4.17375 \, \text{kg}
   \]

### Final Results:
- Mass of Copper: **64.395 kg**
- Mass of Tin: **5.1675 kg**
- Mass of Zinc: **5.76375 kg**
- Mass of Lead: **4.17375 kg**

Would you like more details or further explanations on any part of this process?

Here are some related questions you might find useful:
1. How can we check if the sum of all masses matches the total alloy mass?
2. What is the significance of using percentages in alloy compositions?
3. How would the composition change if the mass of the bronze was increased?
4. What properties of copper make it the majority element in bronze?
5. How would the mass of zinc affect the overall properties of the alloy?

**Tip**: When working with percentages, always convert them to decimals by dividing by 100 to make calculations easier!

Determine the mass of metals A, B, C, and D that form the alloys for casting a bronze mold with a mass of 79.5 kg. The composition of the bronze is: Copper (Cuivre) 81%, Tin (Étain) 6.5%, Zinc 7.25%, Lead (Plomb) 5.25%.

Learn how to calculate the mass of different metals in a bronze alloy given the total mass and the percentage composition. This example uses a total mass of 79.5 kg with varying compositions for copper, tin, zinc, and lead.

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