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Chemical equation for:
Cuprite, copper(I) oxide
Chalcocite, copper(I) sulfide
Covellite, copper(II) sulfide

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Dejanras
Chemical formula for cuprite is Cu₂O. Copper has oxidation number +1 and oxygen has -2 (2·(+1) + (-2) = 0).
Chemical formula for chalcocite is Cu₂S. Copper has oxidation number +1 and sulfur has -2 (2·(+1) + (-2) = 0).
Chemical formula for covellite is CuS. Copper has oxidation number +2 and sulfur has -2.

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