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Question

In the equilibrium NH4HS(s)NH3(g)+H2S(g) If the equilibrium pressure is 2 atm at 80C Kp for the reaction is;

A
0.5
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B
2
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C
1
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D
1.5
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Solution

The correct option is C 1
The equilibrium reaction is NH4HS(s)NH3(g)+H2S(g).

The expression for the equilibrium constant is Kp=PNH3×PH2SPNH4HS=PNH3×PH2S as PNH4HS=1.

The mole fractions of NH3(g)andH2S(g) are 0.5 each.

The partial pressures of NH3(g)andH2S(g) are 0.5×2=1atm each.

Substitute the values in the expression for the equilibrium constant.

KP=1×1=1.

So, the correct option is C

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