   Chapter 14, Problem 41PS

Chapter
Section
Textbook Problem

The reaction of H2 molecules with F atomsH2(g) + F(g) → HF(g) + H(g)has an activation energy of 8 kJ/mol and an enthalpy change of −133 kJ/mol. Draw a diagram similar to Figure 14.11 for this process. Indicate the activation energy and enthalpy change on this diagram.

Interpretation Introduction

Interpretation:

For the given reaction the reaction coordinate diagram has to be drawn by representing the given values in the diagram.

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 in which the rate of the reaction depends on the rate of that slowest step.

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

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

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.

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

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

Explanation

The reaction coordinate for the given chemical reaction is diagrammatic representation of transformation of reactant into product which also indicates the transition state and the intermediate formed in the chemical reaction. The enthalpy change in the reaction is indicated as it is energy changed between the energy of the reactant and the product.

The given reaction has H2(g) and F(g) as its reactants and HF(g)

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