   Chapter 15, Problem 33GQ

Chapter
Section
Textbook Problem

Kp for the formation of phosgene, COCl2, is 6.5 × 1011 at 25 °C.CO(g) + Cl2(g) ⇄ COCl2(g)What is the value of Kp for the dissociation of phosgene?COCl2(g) ⇄ CO(g) + Cl2(g)

Interpretation Introduction

Interpretation: The value of Kp for dissociation reaction of phosgene has to be calculated.

Concept introduction:

• Equilibrium constant: It is the ratio of products to reactants has a constant value when the reaction is in equilibrium at a certain temperature. And it is represented by the letter K.

For a reaction,

aA+bBcC+dD

The equilibrium constant is, K=[C]c[D]d[A]a[B]b

where,

a, b, c and d are the stoichiometric coefficients of reactant and product in the reactions.

• Kp is the equilibrium constant of a reaction at equilibrium which is expressed in terms of partial pressure of gaseous reactants and products in a closed system.
Explanation

The value of Kp for dissociation reaction of phosgene is calculated.

Given,

Kp of formation of COCl2 is 6.5×1011

The balanced chemical equation for the formation of COCl2 is,

CO(g)+Cl2(g)COCl2(g)

The value of Kp for the formation of COCl2 is,’

Kp1=[COCl2][CO][Cl2]=6.5×1011

The balanced chemical equation for dissociation reaction of phosgene is

COCl2(g)

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