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Solution: A strip of pure copper metal weighing 3.178 g is heated in t...

Question

A strip of pure copper metal weighing 3.178 g is heated in the presence of oxygen gas. In the process, all of the copper reacts with oxygen to form 3.978 g of a black copper oxide. What is the empirical formula for this copper oxide?

Given that the molar mass of the compound is about 80 g, name this compound.