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The equilibrium constant, Kc, for the following reaction is 1.80x10^-4 at 298 K. NH4HS(s) ⇌ NH3(g) + H2S(g) If an equilibrium mixture of the three compounds in a 5.35 L container at 298 K contains 3.39 mol of NH4HS(s) and 0.471 mol of NH3, the number of moles of H2S present is ____ moles.