/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 41 The hydrolysis of tert-butyl chl... [FREE SOLUTION] | 91Ó°ÊÓ

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The hydrolysis of tert-butyl chloride is given in the reaction below: $$ \begin{aligned} \left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCl}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \\ &\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}(\mathrm{aq})+\mathrm{H}^{+}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq}) \end{aligned} $$ If the rate law is: Rate \(=\mathrm{k}\left[\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCl}\right]\), what is the order of the reaction with respect to water? a. First b. Second c. Third d. Zero

Short Answer

Expert verified
d. Zero

Step by step solution

01

Understand the Reaction

The given reaction involves the hydrolysis of tert-butyl chloride, where water ( H_2O ) reacts with tert-butyl chloride to form tert-butyl alcohol and ions.
02

Recognize the Rate Law

The rate law provided is: Rate \(= k[(CH_3)_3CCl] \). This indicates that the rate depends solely on the concentration of \((CH_3)_3CCl\), the tert-butyl chloride, and not directly on water.
03

Determine Reaction Order in Terms of Water

The rate law does not include water ( H_2O ). Since the concentration of water does not appear in the rate expression, it means water does not affect the rate of reaction. Therefore, the order of the reaction with respect to water is zero.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Rate Law
In chemical kinetics, the rate law is an essential concept that links the rate of a chemical reaction to the concentration of the reactants. It provides a mathematical expression that tells us how the speed of the reaction depends on the concentration of each reactant involved. The general rate law is typically written as: \[ \text{Rate} = k[A]^{m}[B]^{n} \] where:
  • \(k\) is the rate constant
  • \([A]\) and \([B]\) are the concentrations of the reactants
  • \(m\) and \(n\) are the orders of the reaction with respect to each reactant
In our provided scenario with tert-butyl chloride, the rate law is given as: \[ \text{Rate} = k[(CH_{3})_{3}CCl] \] This means that the reaction rate is solely dependent on the concentration of tert-butyl chloride, making the reaction first-order concerning this substance alone. The absence of water in the rate law indicates that it has no impact on the rate, thus a zero order with respect to water.
Hydrolysis
Hydrolysis is a chemical process where a molecule reacts with water, leading to the breakdown of the molecule into two or more products. In the context of our exercise, tert-butyl chloride undergoes hydrolysis. During hydrolysis of tert-butyl chloride, water (\(H_2O\)) interacts with the compound, causing it to split and form tert-butyl alcohol, along with hydrochloric acid. This reaction involves the cleavage of a bond, typically facilitated by the nucleophilic attack of water.This reaction is significant in reactions involving organic compounds like esters, amides, and the like, where it plays a crucial role in their conversion into simpler substances. Understanding hydrolysis helps in grasping the mechanisms of various biological and chemical systems.
Chemical Kinetics
Chemical kinetics is the branch of chemistry that examines the speed or rate at which chemical reactions occur and the factors affecting these rates. The primary goal is to understand the mechanism and steps of a reaction pathway. Several factors influence reaction rates:
  • Concentration of reactants: Higher concentrations generally increase the rate of reaction as more molecules have the opportunity to collide.
  • Temperature: Raising the temperature typically accelerates reactions by providing more energy to the system, enhancing both collision frequency and energy.
  • Catalysts: These are substances that increase reaction rates without being consumed in the process, by providing an alternative reaction pathway with lower activation energy.
In our example, since tert-butyl chloride concentration is the only factor in the rate law, it indicates no dependency on water or other conditions, which is reflective of an SN1 type reaction where the rate-limiting step involves the decomposition of the reactant into its components.
Reaction Mechanism
A reaction mechanism provides a stepwise description of the events that occur in the course of a chemical reaction. It shows how the products are formed from the reactants and helps to elucidate the dynamics of a reaction. For the hydrolysis of tert-butyl chloride, the reaction likely follows an SN1 mechanism. This involves the following key steps:
  • The tert-butyl chloride first undergoes a slow ionization to form a carbocation intermediate and a chloride ion, which is the rate-determining step.
  • Water, acting as a nucleophile, then rapidly attacks the carbocation, resulting in the formation of tert-butyl alcohol.
Understanding the mechanism helps us predict not only the rate law but also understand the conditions under which the reaction occurs. It is crucial in both research and industrial processes where controlling reaction pathways can lead to more efficient manufacturing of chemicals.

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Most popular questions from this chapter

In the following question two statements Assertion (A) and Reason (R) are given Mark. a. If \(\mathrm{A}\) and \(\mathrm{R}\) both are correct and \(\mathrm{R}\) is the correct explanation of \(\mathrm{A}\); b. If \(A\) and \(R\) both are correct but \(R\) is not the correct explanation of \(\mathrm{A}\); c. \(\mathrm{A}\) is true but \(\mathrm{R}\) is false; d. \(\mathrm{A}\) is false but \(\mathrm{R}\) is true, e. \(\mathrm{A}\) and \(\mathrm{R}\) both are false. (A): The rate constant increases exponentially with the increase in temperature. ( \(\mathbf{R}\) ): With the rise in temperature, the average kinetic energy of the molecules increases.

The following set of data was obtained by the method of initial rates for the reaction: $$ \begin{aligned} &\mathrm{S}_{2} \mathrm{O}_{8}^{2-}(\mathrm{aq})+3 \mathrm{I}^{-}(\mathrm{aq}) \rightarrow \\ &2 \mathrm{SO}_{4}^{2-}(\mathrm{aq})+\mathrm{I}_{3}-(\mathrm{aq}) \end{aligned} $$ What is the rate law for the reaction? $$ \begin{array}{lll} \hline\left[\mathrm{S}_{2} \mathrm{O}_{8}^{2-}\right], \mathrm{M} & {[\mathrm{I}-], \mathrm{M}} & \text { Initial rate, } \mathrm{M} \mathrm{s}^{-1} \\ \hline 0.25 & 0.10 & 9.00 \times 10^{-3} \\ 0.10 & 0.10 & 3.60 \times 10^{-3} \\ 0.20 & 0.30 & 2.16 \times 10^{-2} \\ \hline \end{array} $$ a. Rate \(=\mathrm{k}\left[\mathrm{S}_{2} \mathrm{O}_{8}^{2-}\right]\left[\mathrm{I}^{-}\right]^{2}\) b. Rate \(=\mathrm{k}\left[\mathrm{S}_{2} \mathrm{O}_{8}^{2-}\right]^{2}\left[\mathrm{I}^{-}\right]\) c. Rate \(=\mathrm{k}\left[\mathrm{S}_{2} \mathrm{O}_{8}^{2-}\right]\left[\mathrm{I}^{-}\right]\) d. Rate \(=\mathrm{k}\left[\mathrm{S}_{2} \mathrm{O}_{8}^{2-}\right]\left[\mathrm{I}^{-}\right]^{5}\)

The basic theory behind Arrhenius's equation is that a. The activation energy and pre-exponential factor are always temperature- independent b. The rate constant is a function of temperature c. The number of effective collisions is proportional to the number of molecules above a certain threshold energy d. As the temperature increases, so does the number of molecules with energies exceeding the threshold energy.

The reaction \(\mathrm{X} \rightarrow\) product follows first order kinetics. In 40 minutes, the concentration of \(X\) changes from \(0.1 \mathrm{M}\) to \(0.025 \mathrm{M}\), then the rate of reaction when concentration of \(\mathrm{X}\) is \(0.01 \mathrm{M}\) is a. \(3.47 \times 10^{-5} \mathrm{M} / \mathrm{min}\) b. \(1.73 \times 10^{-4} \mathrm{M} / \mathrm{min}\) c. \(1.73 \times 10^{-5} \mathrm{M} / \mathrm{min}\) d. \(3.47 \times 10^{-4} \mathrm{M} / \mathrm{min}\)

In the following question two statements Assertion (A) and Reason (R) are given Mark. a. If \(\mathrm{A}\) and \(\mathrm{R}\) both are correct and \(\mathrm{R}\) is the correct explanation of \(\mathrm{A}\); b. If \(A\) and \(R\) both are correct but \(R\) is not the correct explanation of \(\mathrm{A}\); c. \(\mathrm{A}\) is true but \(\mathrm{R}\) is false; d. \(\mathrm{A}\) is false but \(\mathrm{R}\) is true, e. \(\mathrm{A}\) and \(\mathrm{R}\) both are false. (A): In order for molecules to interact, they must approach each other so closely to colloid with each other (R): Rearrangement of chemical bonds occur during collision. They must collide each other and rearrangement of chemical bonds occur during collision)

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