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Question

For the equilibrium A(g) <=> B(g) + C(g) , if the initial pressure of A is 1 atm and at equilibrium the total pressure is 1.5 atm, what is Kp ?

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Explanation

Let PB = PC = p , PA = 1 - p , total pressure = (1 - p) + p + p = 1 + p = 1.5 , p = 0.5 . PA = 0.5 atm , PB = PC = 0.5 atm . Kp = (PB PC/PA) = ((0.5)(0.5)/0.5) = 0.5 .

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