Question

A sample of pure Cu (4.00g) heated in a stream of oxyg
the formation of black oxide of copper (CuO). The man
remains unoxidized (Cu = 64)
(A) 90 %
(B) 10%
for some time, gains in weight with
he final mass is 4.90 g. What percent of copper
.
D) 80 %
(C) 20.​

Answer 1

Answer:

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