Answer the following in brief. How will you determine activation energy graphically using the Arrhenius equation? - Chemistry

Question

Answer the following in brief.

How will you determine activation energy graphically using the Arrhenius equation?

Answer in Brief

Solution

Graphical representation of activation energy

Arrhenius equation is `"k" = "Ae"^((-"E"_"a")/("RT"))`

Taking the logarithm of both sides of Eqn. we obtain

In k = -`"E"_"a"/"RT" + "In A"`

Converting the natural base to base 10 we write

This equation is of the form of straight-line y = mx + c.

The Arrhenius plot of log₁₀k versus `1/"T"` gives a straight line as shown in the diagram. A slope of the line is `-"E"_"a"/(2.303 "R")` with its intercept being log₁₀A.

From a slope of the line, the activation energy can be determined.

Variation of log₁₀k with 1/T

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Temperature Dependence of Reaction Rates

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Q 3. xiv. (a)Q 3. xiii. c.Q 3. xiv. (b)

Chapter 6: Chemical Kinetics - Exercises [Page 137]

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Balbharati Chemistry [English] Standard 12 Maharashtra State Board

Chapter 6 Chemical Kinetics
Exercises | Q 3. xiv. (a) | Page 137

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