Answer:

To find the mass of Cu2S that contains the same mass of Cu as is contained in 56.25 kg of CuFeS2, we need to use the molar mass and mole ratio of Cu in both minerals.

Step 1: Calculate the molar mass of CuFeS2 and Cu2S

- The molar mass of CuFeS2 is (1 x 63.55 g/mol Cu) + (1 x 55.85 g/mol Fe) + (2 x 32.06 g/mol S) = 183.47 g/mol
- The molar mass of Cu2S is (2 x 63.55 g/mol Cu) + (1 x 32.06 g/mol S) = 159.16 g/mol

Step 2: Calculate the mole ratio of Cu in CuFeS2 and Cu2S

- In CuFeS2, there is 1 mole of Cu for every 1 mole of CuFeS2
- In Cu2S, there is 2 moles of Cu for every 1 mole of Cu2S

Step 3: Calculate the number of moles of Cu in 56.25 kg of CuFeS2

- 56.25 kg of CuFeS2 is equal to 56,250 g of CuFeS2 (since 1 kg = 1000 g)
- The number of moles of CuFeS2 can be calculated by dividing the mass of CuFeS2 by its molar mass: 56,250 g / 183.47 g/mol = 306.5456 mol
- Since there is 1 mole of Cu for every 1 mole of CuFeS2, the number of moles of Cu in 56.25 kg of CuFeS2 is also 306.5456 mol

Step 4: Calculate the mass of Cu2S that contains the same amount of Cu as 56.25 kg of CuFeS2

- Since there are 2 moles of Cu for every 1 mole of Cu2S, the number of moles of Cu2S needed can be calculated by dividing the number of moles of Cu in CuFeS2 by 2: 306.5456 mol / 2 = 153.2728 mol
- The mass of Cu2S can be calculated by multiplying the number of moles of Cu2S by its molar mass: 153.2728 mol x 159.16 g/mol = 24,392.3 g
- Converting the mass of Cu2S to kg gives us the final answer: 24,392.3 g / 1000 = 24.39 kg

Therefore, the mass of Cu2S that contains the same mass of Cu as is contained in 56.25 kg of CuFeS2 is 24.39 kg.