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akshay.khare91

Let one mole of PCl5 is present and it is given that 20% dissociates
then at equilibrium

no. of moles of PCl5 = 0.8
no. of moles of PCl3 = 0.2
no. of moles of Cl2 = 0.2

now partial pressure = no. of mole/total mole * total pressure

using this find partial pressure

and then find Kp

and then using Kp= Kc(RT)^delta n

find Kc......

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