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PCl5 was taken at 2 atm in a closed vess...

`PCl_5` was taken at 2 atm in a closed vessel at `154^@C` Keeping the temperature constant `PCl_5 leftrightarrow PCl_3+Cl_2` equilibrium is established when 50% of `PCl_5` decomposes. Calculate the `K_p` for the equilibrium.

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`PCl_5 leftrightarrow PCl_3+Cl_2`
2 atm 0 atm 0 atm at start
1 atm 1 atm 1 atm at equilibrium
The equilibrium constant `K_p= (Ppcl_3 P cl_2)/(P pcl_5)=1 atm`
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