MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryChemical EquilibriumEquilibrium Constant & Concentrations
An amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. pressure. Ammonium hydrogen sulphide decomposes to yield NH3 and H2S 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 NH4HS decomposition at this temperature is
A.0.30
B.0.18
C.0.17
D.0.11✓ Correct
Explanation
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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