Chapter 15.2, Problem 15.2CYU

### Chemistry & Chemical Reactivity

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

Chapter
Section

### Chemistry & Chemical Reactivity

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

# Answer the following questions regarding the butane ⇄ isobutane equilibrium (Kc = 2.50 at 298 K). (a) Is the system at equilibrium when [butane] = 0.00097 M and [isobutane] = 0.00218 M? If not, in which direction will the reaction proceed to achieve equilibrium? (b) Is the system at equilibrium when[butane] = 0.00075 M and [isobutane] = 0.00260M? If not, in which direction will the reaction proceed to achieve equilibrium?

(a)

Interpretation Introduction

Interpretation: The given system is in equilibrium or not has to be identified and the direction which proceeds to achieve equilibrium has to be given.

Concept Introduction: For a reaction, aA+bBcC+dD ,

The reaction quotient,Q=[C]c[D]d[A]a[B]b

Q<K, means some reactants must convert to products for the reaction to reach equilibrium.

Q>K, means some products must convert to reactants for the reaction to reach equilibrium.

Explanation

From the given concertation,

The reaction quotient,Qâ€‰=â€‰0.002180.00097=2

(b)

Interpretation Introduction

Interpretation: The given system is in equilibrium or not has to be identified and the direction which proceeds to achieve equilibrium has to be given.

Concept Introduction: For a reaction, aA+bBcC+dD ,

The reaction quotient,Q=[C]c[D]d[A]a[B]b

Q<K, means some reactants must convert to products for the reaction to reach equilibrium.

Q>K, means some products must convert to reactants for the reaction to reach equilibrium.

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