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A 1-g mixture of cuprous oxide and cupric oxide was quantitatively reduced to 0.839 g of metallic. What was the weight of cupric oxide in the original sample? ( Cu = 63.5 , O = 16 )

A 1-g mixture of cuprous oxide and cupric oxide was quantitatively reduced to 0.839 g of metallic. What was the weight of cupric oxide in the original sample? ( Cu = 63.5 , O = 16 ) 

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