Formamide (HCONH2), used in the manufacture of pharmaceutical substances, dyes, and agricultural chemicals, decomposes at 400 K according to the following reaction: HCONH2 (g) ⇌ NH3 (g) + CO (g). If the initial concentration of HCONH2 is 0.0861 M and, once dissociated, the equilibrium carbon monoxide concentration is 0.0846 M, what is the concentration-based equilibrium constant (Kc) for the reaction?

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