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%
waec 1995chemistry

The correct answer is A. 88.9%

No explanation given
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