The equilibrium, NH4HS(s)⇌NH3(g)+H2S(g), is followed to set-up at 127∘C in a closed vessel. The total pressure at equilibrium was 20atm. The Kc for the reaction is: (Given R=0.08L atm K−1mol−1)
A
0.097M2
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B
0.085M2
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C
3.045M2
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D
1.04M2
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Solution
The correct option is A0.097M2 pNH3=pH2S=202atm Kp=pNH3×pH2S=100atm2 Kp=Kc(RT)Δn 100=Kc×(0.08×400)2 Kc=0.097M2