A sample of ammonium carbamate, NH₄(NH₂CO₂), of mass 25.0 g was placed in an evacuated flask of volume 0.250 L and kept at 25°C. At equilibrium, 17.4 mg of CO₂ was present. What is the value of Kc for the decomposition of ammonium carbamate into ammonia and carbon dioxide? The reaction is

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NH,(NH,CO,)(s)<→2NH3(g) + 2NH3(g) + CO₂(g).