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Solid copper reacts with solid sulfur to form Copper(I) sulfide.
2Cu(s)+S(s) -> Cu2S(s)
POSSIBLE ACTIONS:- the solid is dissolved or- the solid is insoluble or- the solid react with the solution
A gas by definition is NOT a solid. Gas and Solid are discrete states (phases) of matter.
2Cu(s)+S(s)→Cu2S(s)
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