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The equilibrium constant, Kc, for the following reaction is 1.80 x 10^-4 at 298 K. NH4HS(s) -> NH3(g) + H2S(g) Calculate the equilibrium concentration of H2S when 0.251 moles of NH4HS(s) are introduced into a 1.00 L vessel at 298 K. [H2S] = ___ M