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Question

A vessel contains 1 mole PCl5(g) at 4 atm and 0.5 mole PCl3 formed at equilibrium. Now, equilibrium pressure of mixture is (assume ideal behavior)

A
16 atm
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B
6 atm
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C
2 atm
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D
4.5 atm
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Solution

The correct option is B 16 atm
PCl5PCl3+Cl2initially100atequlibrium10.50.50.5
Total pressure = g
Initial pressure = 4 atm
(0.51.5)g=4g=4×3=12KP=PPCl3PCl2PPCl5=(0.51.5)g(0.51.5)g(0.51.5)g=13g=13(12)=4
Equilibrium Pressure = 4 × 4 = 16 atm

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