Answered: A certain decomposition reaction is…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A certain decomposition reaction is first order with a rate constant of 6.85*10^-4s^-1at 25 degrees Celsius.
If the original concentration of reactant A is 0.365 M how long (in seconds) will it take for 1/3 of reactant A to have reacted?

Expert Solution

Step 1) first order reaction

* First order reaction =>

Rate = [A]^¹

Kt = ln {A₀/A}

Where,

K = rate constant

{ A₀} is intial concentration

{ A } is final concentration

t is take by reaction

* intial concentration {A₀} = 0.365 M

And only 1/3 of reactant is reacted

So, final concentration of reactant = A₀- A₀/3

final concentration = (3A₀- A₀) / 3

final concentration = 2A₀/3

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