Question

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 $\mathrm { NH } _ { 3 }$ and $\mathrm { H } _ { 2 } \mathrm {~S}$ 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 decomposition at this temperature is.

• A. 0.30
• B. 0.18
• C. 0.17
• D. 0.11

Answer 1

Answer: (D)

0.11

Answer 2

⇌

Total pressure

i.e.,

$\mathrm { K } _ { \mathrm { p } } = \mathrm { P } _ { \mathrm { NH } _ { 3 } } \cdot \mathrm { P } _ { \mathrm { H } _ { 2 } \mathrm {~S} }$= 0.1139