   Chapter 14.7, Problem 2.2ACP

Chapter
Section
Textbook Problem

Show that the two step mechanism proposed by Sullivan yields the correct (overall second-order) rate law.

Interpretation Introduction

Interpretation: The two step mechanism proposed by Sullivan yields the overall second order rate law has to be shown.

Concept introduction:

Rate law or rate equation: The relationship between the reactant concentrations and reaction rate is expressed by an equation.

aA + bBxXRate of reaction = k [A]m[B]nTotalorderof reaction = (m + n)

Rate constant, k: It is a proportionality constant that relates rate and concentration at a given temperature.

Explanation

The rate law is given as,

Fast equilibrium:I2(g)2I(g)Rate=k1[I2](1)Rate=k-1[I]2(2)Equatingrateequation(1and2):k1[I2]=k-1[I]2[I]2=k1k-1[I2](3)slowprocess:H2(g)+2I(g)

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