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Chemistry & Chemical Reactivity

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

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

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

A proposed mechanism for the reaction of NO2 and CO is

Step 1: Slow, endothermic

2 NO2(g) → NO(g) + NO3(g)

Step 2: Fast, exothermic

NO3(g) + CO(g) → NO2(g) + CO2(g)

Overall Reaction: Exothermic

NO2(g) + CO(g) → NO(g) + CO2(g)

  1. (a) Identify each of the following as a reactant, product, or intermediate: NO2(g), CO(g), NO3(g), CO2(g), NO(g).
  2. (b) Draw a reaction coordinate diagram for this reaction. Indicate on this drawing the activation energy for each step and the overall enthalpy change.

(a)

Interpretation Introduction

Interpretation:

The given molecules have to be identified as a reactant, product or intermediate.

Concept introduction:

In order to establish the plausibility of a mechanism, one must compare the rate law of the rate determining step to the experimentally determined rate law.

Rate determining step: In a chemical reaction the rate determining step is the slowest step. The rate of the reaction depends on the rate of that slowest step.

Rate law: It is generally the rate equation that consists of the reaction rate with the concentration or the pressures of the reactants and constant parameters.

Intermediate species: It is the species formed during the middle of the chemical reaction between the reactant and the desired product.

Activation energy: It is the minimum energy required by the reacting species in order to undergo chemical reaction.

In a chemical reaction, the species that present left is denoted as reactant which undergoes chemical change and result to give new species called product.

In a chemical reaction, the species that present in right side is denoted as product that results from the reactant.

Reaction coordinate: It is the diagrammatic representation of a chemical reaction which depicts how the reactants gets transformed into product where the transition state and the intermediates present in the reaction are also depicted.

The change in the energy as the product formed from the reactants is represented by the enthalpy change in the reaction coordinate diagram.

Explanation

The overall chemical reaction NO2(g)+CO(g)NO(g)+CO2(g) is examined in order to identify the given species as reactant, product or the intermediate. The species present in the left side of reaction are generally denoted as reactants since they undergo chemical change and gives rise to species in the right side of the reaction called as products. The intermediate are species are formed in between the reactant and the product.

Therefore, the given species are identified as follows,

NO2(g)-Reactant since it present in left of reaction

(b)

Interpretation Introduction

Interpretation:

The reaction coordinate diagram for the given reaction has to be given and also indicate the activation energy for each step and the overall enthalpy change.

Concept introduction:

In order to establish the plausibility of a mechanism, one must compare the rate law of the rate determining step to the experimentally determined rate law.

Rate determining step: In a chemical reaction the rate determining step is the slowest step. The rate of the reaction depends on the rate of that slowest step.

Rate law: It is generally the rate equation that consists of the reaction rate with the concentration or the pressures of the reactants and constant parameters.

Intermediate species: It is the species formed during the middle of the chemical reaction between the reactant and the desired product.

Activation energy: It is the minimum energy required by the reacting species in order to undergo chemical reaction.

In a chemical reaction, the species that present left is denoted as reactant which undergoes chemical change and result to give new species called product.

In a chemical reaction, the species that present in right side is denoted as product that results from the reactant.

Reaction coordinate: It is the diagrammatic representation of a chemical reaction which depicts how the reactants get transformed into product where the transition state and the intermediates present in the reaction are also depicted.

The change in the energy as the product formed from the reactants is represented by the enthalpy change in the reaction coordinate diagram.

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