What is the percentage by mass of copper in copper in copper (l) oxide (CU2O)? [O = 16; CU =64] by Sunday | Aug 22 | Chemistry WAEC | 0 comments A. 88.9% B. 80.0% C. 66.7% D. 20.0% E. 11.1% Correct Answer: Option A – 88.9% Users Also Read These:What is the percentage of sulphur in sulphur (IV) oxide?What mass of copper in gram would be deposited by a…An oven dried soil sample of mass 8g had a mass of…The system of election whereby each political party…A solution contains 20g of solute in 180g of…