   # Determine the activation energy for the reaction of H 2 and I 2 to produce HI, given the data in the table. ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 14.6, Problem 6Q
Textbook Problem
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## Determine the activation energy for the reaction of H2 and I2 to produce HI, given the data in the table. Interpretation Introduction

Interpretation: The value of activation energy has to be given.

Concept introduction:

Arrhenius equation:

Arrhenius equation is used to calculate the rate constant of many reactions. Arrhenius equation takes the form

k=Ae-Ea/RT

Where,

k=rate constant

A=frequency factor

e=base of logarithms

Ea = energy of activation

T=Temperature

Mathematically, the above equation can be written as,

lnk=lnA-EaRT

Determination of activation energy: If the rate constant for a given reaction are measured at several temperatures, graphical techniques used to determine the activation energy of a reaction.

lnk =-(EaR)1T+lnA Equation for straight line:_lnkindicates y-axis.(EaR)indicates slope1T indicates x-axislnAindicates intercept.

### Explanation of Solution

A graph of ln (k) versus 1/T, where T is in kelvins, yields a straight line with slope of -2.235×104K.  The activation energy is calculated as,

slope:=-2.235×104K (obtained  by a linear squares fit of the line by Microsoft Excel)Calculateactivationenergy:slope=-E

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