An amount of solid is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. pressure. Ammonium hydrogen sulphide decomposes to yield and gases in the flask. When the

Question

An amount of solid $NH_4HS$ 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 $H_2S$ 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 $NH_4HS$ decomposition at this temperature is

Prashant Kotian · Accepted Answer

Correct answer: D. Let us consider the given reaction: CHEMICAL EQUILIBRIUM 41 4 3 2 3 1 NH HS NH H S initial 0.50 0 at eqm. 0.50+x x Total pressure 0.5 x x 2x 0.5 0.84 x 0.17atm Let pressure of NH P 0.5 0.17 0.67atm. Le 2 2 2 1 2 t pressure of H S P 0.17atm K P P 0.11atm x

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