Copper metal can be prepared by roasting copper ore, which can contain cuprite (Cu₂S) and copper(II) sulfide. Cu₂ S(s) + O₂(g) → 2 Cu(s) + SO₂ (g) CuS(s) + O₂(g) → Cu(s) + SO₂ (g) Suppose an ore sample contains 10.0% impurity in addition to a mixture of CuS and Cu₂ S. Heating 100.0 g of the mixture produces 75.8 g of copper metal with a purity of 91.1%. What is the weight percent of CuS in the ore? The weight percent of Cu₂ S? Weight percent of Cus = Weight percent of Cu₂ S = % %

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".