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1g mixture of cuprous oxide and cupric oxide was quantitatively reduced to 0.839g of metallic copper.What was the weight of cupric oxide in the original sample?(Cu=63.5,O=16)
let cupric oxide =x and let cuprous oxide=y
x+y=1g
x(63.5/(63.5+16))+y(127/(127+16))=0.839g
solve for x and y
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