A sample of pure Cu (4.00 g) heated in a stream of oxygen for some tim – InterviewSolution

1.	A sample of pure Cu (4.00 g) heated in a stream of oxygen for some time, gains in weight with the formation of black oxide of copper (CuO) . The final mass is 4.90 g. What percent of copper remains unoxidized (Cu=64)
Answer» `90%` `10 %` `20 %` `80 %` ANSWER :B

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