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An amount of solid NH4 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 decomposses 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

A

0.11

B

0.17

C

0.18

D

0.3

Text Solution

Verified by Experts

The correct Answer is:
A
`NH_(4)HS(s) rarr NH_(3)(g) + H_(2)S(g)`
0.5 + 2P = 0.84
`2P = 0.34 implies P = 0.17`
`K_(p) = P_(NH_(3)) xx P_(H_(2)S) = 0.67 xx 0.17 = 0.11`

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