Final answer:
The percentage of copper in the bronze is 87.5%, and the percentage of tin is 12.5%.
Step-by-step explanation:
To find the percentage of copper and tin in the bronze, we need to calculate the mass of each element as a percentage of the total mass of the bronze.
The total mass of the bronze is 4 kg, and it contains 3.5 kg of copper and 0.5 kg of tin.
To calculate the percentage of copper, we can use the formula:
Percentage of Copper = (Mass of Copper / Total Mass of Bronze) * 100
Substituting the values, we get:
Percentage of Copper = (3.5 kg / 4 kg) * 100 = 87.5%
Similarly, to calculate the percentage of tin:
Percentage of Tin = (Mass of Tin / Total Mass of Bronze) * 100
Substituting the values, we get:
Percentage of Tin = (0.5 kg / 4 kg) * 100 = 12.5%