Oxide Black

What is the formula of rust?
electrolytic copper strip sheer weight of 3.178 grams is strongly heated in a stream of oxygen until everything becomes a black oxide. The black power resulting weights 3.978 g. What is the formula of rust? Suggest a reaction balanced for this process.
CuO (cupric oxide) 2 Cu (s) + O2 (g) -> 2 CuO (s)
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