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Q.

Phosgene gas (COCl2) dissociates to carbon monoxide gas and chlorine gas with a change of pressure from 450 mm Hg to 600 mm Hg. If volume and temperature remain constant throughout the experiment, the value of Kp is ______.

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answer is 75.

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Detailed Solution

It is given to calculate the value of Kp.

COCl2(g)⇌CO(g)+Cl2(g)

K(p)=[CO][Cl2]COCl2

Initial:              

450

-

-

Change:         

-x

+x

+x

At equilibrium

450-x

+x

+x

 450 – x + x + x = 600

Therefore x = 150

K(p)=[CO][Cl2]COCl2

= [150][150]450-150

= 22500300 = 75.

Hence, the answer is 75.

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