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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

The equilibrium constant is 0.0900 at 25°C for the reaction

H 2 O ( g ) + Cl 2 O ( g ) 2 HOCl ( g )

  For which of the following sets of conditions is the system at equilibrium? For those that are not at equilibrium, in which direction will the system shift?

  a. P H 2 O = 1.00 atm , P Cl 2 O = 1.00 atm , P HOCl = 1.00 atm

  b. P H 2 O = 200. torr , P Cl 2 O = 49.8 torr , P HOCl = 21.0 torr

  c. P H 2 O = 296 torr , P Cl 2 O = 15.0 torr , P HOCl = 20.0 torr

(a)

Interpretation Introduction

Interpretation:

The equilibrium constant value at 25°C for the stated reaction between H2O and Cl2O is 0.0900 .  The values that correspond to a system at equilibrium are to be identified. The direction of shift for the reactions that are not at equilibrium is to be stated.

Concept introduction:

The state when the reactants involved in a chemical reaction and the products formed in the reaction exist in concentrations having no further tendency to change is known as an equilibrium state of the reaction. When the equilibrium constant is expressed in terms of pressure, it is represented as Kp . A reaction quotient is defined as a function of concentrations of the involved chemical species in a given chemical reaction. It is represented by ‘ Q ’. At equilibrium, the value of Q is equal to the value of the equilibrium constant.

Explanation

To determine: If the given values correspond to a system at equilibrium and the direction of shift if the reaction is not at equilibrium.

Given

The stated reaction is,

H2O(g)+Cl2O(g)2HOCl(g)

The partial pressure for H2O (PH2O) is 1.0atm .

The partial pressure for Cl2O (PCl2O) is 1.0atm .

The partial pressure for HOCl (PHOCl) is 1.0atm

(b)

Interpretation Introduction

Interpretation:

The equilibrium constant value at 25°C for the stated reaction between H2O and Cl2O is 0.0900 .  The values that correspond to a system at equilibrium are to be identified. The direction of shift for the reactions that are not at equilibrium is to be stated.

Concept introduction:

The state when the reactants involved in a chemical reaction and the products formed in the reaction exist in concentrations having no further tendency to change is known as an equilibrium state of the reaction. When the equilibrium constant is expressed in terms of pressure, it is represented as Kp . A reaction quotient is defined as a function of concentrations of the involved chemical species in a given chemical reaction. It is represented by ‘ Q ’. At equilibrium, the value of Q is equal to the value of the equilibrium constant.

(c)

Interpretation Introduction

Interpretation:

The equilibrium constant value at 25°C for the stated reaction between H2O and Cl2O is 0.0900 .  The values that correspond to a system at equilibrium are to be identified. The direction of shift for the reactions that are not at equilibrium is to be stated.

Concept introduction:

The state when the reactants involved in a chemical reaction and the products formed in the reaction exist in concentrations having no further tendency to change is known as an equilibrium state of the reaction. When the equilibrium constant is expressed in terms of pressure, it is represented as Kp . A reaction quotient is defined as a function of concentrations of the involved chemical species in a given chemical reaction. It is represented by ‘ Q ’. At equilibrium, the value of Q is equal to the value of the equilibrium constant.

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