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2636.06 g
Explanation:
For this question, there are three chemical equations, these balnced chemical equation are given below:
Reaction 1 => 2 CuFeS₂ + 30₂ -------------------------------------> 2CuS + 2Fe0 + 2S0₂
Reaction 2 => 2 CuS -------------------------------------------------------> Cu₂S + S
Reaction 3 => Cu₂S + S + 2O₂ --------------------> 2Cu + 2SO₂
It is given from the question above that each reaction involving copper proceeded in 69.00 % yield = 0.69.
The number of moles Cu₂S = 2.36/0.69 = 3.42 mol.
The number of moles of CuS from Cu₂S [from the second reaction] = 2 × 3.42 = 6.84 mol.
For the 3rd reaction and the 2nd reaction , the yield = 0.69.
The required number of moles of CuS = 6.84/ 0.69 = 9.91 mol.
The number of moles of CuFeS₂ = 9.91 /0.69 = 14.36 mol.
The amount of chalcopyrite had be mined to produce 100 pennies = 14.36 × 183.54 = 2636.06 g