   # A proposed mechanism for a reaction is C 4 H 9 Br → C 4 H 9 + + Br − S l o w C 4 H 9 + + H 2 O → C 4 H 9 OH 2 + F a s t C 4 H 9 OH 2 + + H 2 O → C 4 H 9 OH + H 3 O + F a s t Write the rate law expected for this mechanism. What is the overall balanced equation for the reaction? What are the intermediates in the proposed mechanism? ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 11, Problem 61E
Textbook Problem
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## A proposed mechanism for a reaction is         C 4 H 9 Br   →   C 4 H 9 +   +   Br −                                           S l o w C 4 H 9 +   +   H 2 O   →   C 4 H 9 OH 2 +                                                 F a s t C 4 H 9 OH 2 +   +   H 2 O   →   C 4 H 9 OH   +   H 3 O +     F a s t Write the rate law expected for this mechanism. What is the overall balanced equation for the reaction? What are the intermediates in the proposed mechanism?

Interpretation Introduction

Interpretation: A proposed mechanism of a reaction is given. The rate law and overall balanced equation for the reaction is to be calculated. The intermediates in the proposed mechanism are to be identified.

Concept introduction: The change observed in the concentration of a reactant or a product per unit time is known as the rate of the particular reaction. The differential rate law provides the rate of a reaction at specific reaction concentrations.

To determine: The rate law, overall balanced equation and intermediates in the proposed mechanism of the given reaction.

### Explanation of Solution

The rate law for the given reaction is,

Rate=k[C4H9Br]

The slow step of reaction mechanism is rate determining step. In the given mechanism of a reaction, first step is slow step. Hence, it is a rate determining step.

The proposed first step mechanism is,

C4H9BrC4H9++Br

The rate law gives the relation between reaction rate and concentration of reactants. The rate law is represented as,

Rate=k[A]

Where,

• k isthe rate constant.
• [A] isthe concentration of reactant.

Hence, the rate law for the given reaction is,

Rate=k[C4H9Br]

The overall balanced reaction is,

C4H9Br+2H2OC4H9OH+Br

The first step in proposed mechanism is,

C4H9BrC4H9++Br

The second step in proposed mechanism is,

C4H9++H2OC4H9OH2+

The third step in proposed mechanism is,

C4H9OH2++

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