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An impure sample of cuprite (Cu2O) contains 66.6% Copper by mass. Find the ratio of % of pure Cu20to % of impurity by mass in the sample. Take-0.4.a.66.6 x 143254- 37.5.noutron underooas a nucleaar reaction vielding element |
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Answer» Assume you have 100g of sample. That means you have 66.6 g of Cu. The number of moles is: 66.6g /63.6 g/mol = 1.05 moles.Since you have 1 mole of oxygen per 2 moles of Cu, you then have 0.53 moles of oxygen.The weight of the oxygen is then 0.53 mol X 16 g/mol = 8.42 g.Add that to the wieght of the copper and you have 75.02 g of Cu2O in 100 g of sample.That means your sample is 75.02% pure Cu2O |
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