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Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide if the salt is heated to a...

Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide if the salt is heated to a sufficiently high temperature. Some ammonium iodide is placed in a flask, which is then heated to 400 °C. If the total pressure in the flask when equilibrium has been achieved is 705 mm Hg, what is the value of Kp (when partial pressures are in atmospheres)? NH4I(s) <---> NH3(g) + HI(g)

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