5 mol PCl5(g) an one mole N2 gas is placed in a closed vessel. at equillibrium PCl5(g) decomposes by 20% and total pressure in the container is found to be 1 atm. the kP for the equillibrium PCl5(g)⇋PCl3(g)+Cl2(g) is:
A
1/24 atm
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B
1/4 atm
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C
1/16 atm
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D
1/28 atm
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Solution
The correct option is D 1/28 atm
To find kpfullsize.png)
Total moles at equb" =4+1+1=6
but 1 mole of N2 also =6+1=7
Kp=KPPCl3×KPCl2KPPCl5=17×1247=128 Hence, (D) is correct