When Copper (II) Sulfide is partially roasted in air (reaction with O2), Copper (I) Sulfide is formed first. Subsequently, upon heating, the copper sulfide thermally decomposes to Copper (I) Oxide and Sulfur Dioxide. Write a balanced equation for these two reactions.
2CuS + O2 → Cu2S + SO2
2Cu2S + 3O2 → 2Cu2O + 2SO2
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