![What is the percentage by mass of copper in copper in copper (l) oxide (CU2O)? [O = 16; CU =64]](https://erudites.ng/wp-content/plugins/accelerated-mobile-pages/images/SD-default-image.png)
![What is the percentage by mass of copper in copper in copper (l) oxide (CU2O)? [O = 16; CU =64]](https://erudites.ng/wp-content/uploads/2020/06/past-questions-and-answers.jpg)
A. 88.9%
B. 80.0%
C. 66.7%
D. 20.0%
E. 11.1%
Correct Answer:
Option A – 88.9%
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