A 10.0 g sample of an oxide of copper forms metallic copper and 1.26 g of water when heated in a str — Stoichiometry Chemistry Question
Question
A 10.0 g sample of an oxide of copper forms metallic copper and 1.26 g of water when heated in a stream of hydrogen. What is the mass percent of copper in this oxide?
A.
11.2%
B.
66.6%
C.
79.9%
D.✓ Correct
88.8%
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