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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

The colorless gas N2O4, decomposes to the brown gas NO2 in a first-order reaction.

N2O4(g) → 2 NO2(g)

The rate constant k = 4.5 × 103 s‒1 at 274 K and k = 1.00 × 104 s‒1 at 283 K. What is the activation energy, Ea?

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

Explanation

The activation energy is calculated as,

  Given:k1 = 4.5×103s1;T1= 274Kk2 = 1.00×104s1;T2= 283KArrhenius equation:_ln k1=-(EaRT1)+lnA;ln k2=-(EaRT2)+lnAln k2ln k1=lnk2k1=(EaR)[1T21T1]Bysubstituting,ln(1

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