Question

There are two different oxides of copper produced as a result of this reaction. They are copper(I) and copper(II) oxide. If copper is changed to copper(I) oxide the percentage changed in mass is 12%. If copper is changed to copper(II) oxide the percentage change in mass is 25%. What must have been produced as a result of the investigation to give the percentage change in mass you calculated?
What reaction? What change in % did you calculate? I don't get the question?
I don't know I copied the question word for word. He wants to know what was produced and percentage changes. I'm sorry
What is the "mass you calculated" refer to?

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