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An amount of solid NH(4) HS is placed in...

An amount of solid `NH_(4) HS` is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm, pressure . Ammonium hydrogen sulphide decomposes to yield `NH_(3)` and `H_(2) S` gases in the flask . When the decomposition reaction reaches equilibrium the total pressure in the flask rises to 0.84 atm . The equilibrium constant for `NH_(4) HS` decomposition at this temperature is

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