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Question

For the reaction AB(g)A(g)+B(g), AB is 33% dissociatated at a total pressure of P. Then

A
P=Kp
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B
P=4Kp
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C
P=3Kp
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D
P=8Kp
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Solution

The correct option is D P=8Kp
AB(g)A(g)+B(g)100113=231313 at equilibrium
total number of moles=
(Σn)eqlm=23+13+13=43Partial pressure of A=B=1/34/3×P=P4
Partial pressure of AB= 2/34/3×P=P2
From the equation,
AB(g)A(g)+B(g)
Kp can be given as:
Kp=PAPBPAB
Substituting the values, we get
Kp=P/4×P/4P/2
Kp=P8
P=8KP

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