Ca-->CaS-->CaCl2-->Ca(NO3)2-->CaSo4-->CaS

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вопрос

This is a series of chemical reactions starting with calcium (Ca) and ending with calcium sulfide (CaS). The reactions are as follows:

Ca + S → CaS (calcium sulfide)CaS + 2 HCl → CaCl2 + H2S (calcium chloride)CaCl2 + 2 AgNO3 → Ca(NO3)2 + 2 AgCl (calcium nitrate)Ca(NO3)2 + Na2SO4 → CaSO4 + 2 NaNO3 (calcium sulfate)CaSO4 + 2 H2S → CaS + 2 H2O (calcium sulfide)

So, starting with calcium, the final product is calcium sulfide.