Determine the number of grams of Cu present in 4.0kg of CuFeS2

The molar mass of CuFeS2 is 184 g/mol
4000/184 = 21.739 moles of CuFeS2
There is a 1:1 ratio of CuFeS2: Cu
The molar mass of Cu is 64 g/mol
21.739 * 64 = 1391.3 grams of Cu.

4000g x molar mass of Fe/molar mass of CuFeS2

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