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Copper(l) sulfide can react with oxygen to produce copper metal by a reaction Cu2(s) + O2 => 2Cu + SO2 If 5.00 g of Cu2S is used, then what is the theoretical yield of Cu? A. 10.0 g B. 1.99 g C. 1.00 g D. 5.00 g E. 3.99 g