Solid NH4HS decomposes by the following endothermic reaction:   NH4HS (s)       NH3 (g)     +     H2S (g) If the system was at equilibrium, what effect would each of the following have on the system.  For your answer, indicate whether the reaction shifts to the left, shifts to the right, or no change to reestablish equilibrium. a.  The concentration of NH3 is increased. b.  Additional NH4HS is added to the system. c.  The volume of the container the reaction is placed in increases. d.  The container that contains the reaction is cooled in an ice bath.

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