Trimethylamine and chlorine dioxide react in water in an electron transfer reaction to form the trimethylamine cation and chlorite ion: 1CH323 N1aq2 + ClO21aq2 + H2O1l2S 1CH323 NH+1aq2 + ClO2 -1aq2 + OH-1aq2 Initial rate data obtained at 23 °C are listed in the following table. (b) What would be the initial rate in an experiment with initial concentrations 31CH323 N4 = 4.2 * 10-2 M and 3ClO24 = 3.4 * 10-2 M?

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1

Identify the rate law expression for the reaction. The rate law is generally expressed as: \( \text{Rate} = k [\text{CH}_3)_3\text{N}]^m [\text{ClO}_2]^n \), where \( k \) is the rate constant, and \( m \) and \( n \) are the reaction orders with respect to trimethylamine and chlorine dioxide, respectively.

Use the initial rate data provided in the table to determine the reaction orders \( m \) and \( n \). This typically involves comparing experiments where the concentration of one reactant is varied while the other is held constant.

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Once the reaction orders \( m \) and \( n \) are determined, calculate the rate constant \( k \) using one of the experiments from the table. Substitute the known concentrations and the initial rate into the rate law expression to solve for \( k \).

With the rate constant \( k \) and the reaction orders \( m \) and \( n \) known, substitute the given initial concentrations \([\text{CH}_3)_3\text{N}] = 4.2 \times 10^{-2} \text{ M}\) and \([\text{ClO}_2] = 3.4 \times 10^{-2} \text{ M}\) into the rate law expression.

Calculate the initial rate using the rate law expression with the substituted values. This will give you the initial rate for the specified concentrations.

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주요 개념

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Electron Transfer Reactions

Electron transfer reactions, also known as redox reactions, involve the transfer of electrons between chemical species. In this context, trimethylamine donates electrons to chlorine dioxide, resulting in the formation of the trimethylamine cation and the chlorite ion. Understanding the roles of oxidizing and reducing agents in these reactions is crucial for predicting the products and the overall reaction mechanism.

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가이드 코스

03:29

Electron Capture & Positron Emission Reaction Example

Rate of Reaction

The rate of reaction refers to the speed at which reactants are converted into products. It can be influenced by factors such as concentration, temperature, and the presence of catalysts. In this question, the initial rate is determined by the concentrations of trimethylamine and chlorine dioxide, which can be analyzed using rate laws to predict how changes in concentration affect the reaction rate.

추천 영상:

가이드 코스

02:03

Average Rate of Reaction

Concentration and Stoichiometry

Concentration is a measure of the amount of a substance in a given volume of solution, typically expressed in molarity (M). Stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction. In this scenario, understanding the initial concentrations of trimethylamine and chlorine dioxide is essential for calculating the initial rate of the reaction, as it directly impacts the reaction dynamics according to the stoichiometric coefficients.

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가이드 코스

01:16

Stoichiometry Concept

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교과서 질문

Chlorite is reduced by bromide in acidic solution according to the following balanced equation: ClO2 -1aq2 + 4 Br-1aq2 + 4 H+1aq2S Cl-1aq2 + 2 Br21aq2 + 2 H2O1l2 (a) If Δ3Br24>Δt = 4.8 * 10-6 M>s, what is the value of Δ3ClO2 -4>Δt during the same time interval?

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교과서 질문

Initial rate data at 25 °C are listed in the table for the reaction NH4 +1aq2 + NO2 -1aq2S N21g2 + 2 H2O1l2

(b) What is the value of the rate constant?