What is the percentage by mass of copper in copper in copper (l) oxide (CU2O)?…

What is the percentage by mass of copper in copper in copper (l) oxide (CU2O)? [O = 16; CU =64]
  • A.
    88.9%
  • B.
    80.0%
  • C.
    66.7%
  • D.
    20.0%
  • E.
    11.1%
Correct Answer: Option A
Explanation
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