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NH4HS(s) ⇌ NH3(g) + H2S(g) is an endothermic process. A 6.1589−g sample of the solid is placed in an evacuated 4.000−L vessel at exactly 24°C. After equilibrium has been established, the total pressure inside is 0.709 atm. Some solid NH4HS remains in the vessel. (a) What is the KP for the reaction? (b) What percentage of the solid has decomposed?