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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
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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