At certain temperature, PCl5(g) is 25% dissociated. If the equilibrium pressure is 3 atm, Kp for PCl5⇌PCl3+Cl2 is

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0.4 atm

0.2 atm

0.6 atm

0.266 atm

answer is B.

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Detailed Solution

PCl5⇌PCl3+Cl2 1 0 0 0.25 0.25 0.25_ 0.75 0.25 0.25 ∴ Kp=(0.251.25×3)(0.251.25×3)(0.751.25×3) =35×35×53×3 =0.2

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