Copper metal can be prepared by roasting copper ore, which can contain cuprite (Cu₂S) and copper(II) sulfide.

Suppose an ore sample contains 11.0% impurity in addition to a mixture of CuS and Cu₂S. Heating 100.0 g of the mixture produces 75.4 g of copper metal with a purity of 89.5%. What is the weight percent of CuS in the ore? The weight percent of Cu₂S? 

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Cu₂S(s) + O₂(g) → 2 Cu(s) + SO₂(g) CuS(s) + O₂(g) → Cu(s) + SO₂(g)