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Question

A definite amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm pressure. NH4HS decomposes to give NH3 and H2S and at equilibrium total pressure in flask is 0.84 atm. The equilibrium constant for the reaction is:

A
0.30
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B
0.18
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C
0.17
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D
0.11
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Solution

The correct option is A 0.11
NH4HS(s)NH3(g)+H2S(g)
Initial a 0.5atm 0atm
equilibrium ax 0.5+x x
Total pressure =0.5+x+x
=0.5+2x
i.e. x=0.17
Kp=PNH3PH2S
=(0.67)×(0.17)
Kp=0.1139
So, option D is correct.

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