What was the percent by mass of cu2o


A mixture of Cu2O which is having 4.6127-gram (molar mass 143.091 grams) and CuO (molar mass 79.545 grams) was treated to remove all the oxygen. What was the percent by mass of Cu2O in the original mixture if 3.8128 grams of pure copper were isolated?

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Chemistry: What was the percent by mass of cu2o
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