A certain decomposition reaction is first order with a rate constant of 6.85*10-4 s-1 at 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?
A certain decomposition reaction is first order with a rate constant of 6.85*10-4 s-1 at 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?
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter14: Chemical Kinetics: The Rates Of Chemical Reactions
Section: Chapter Questions
Problem 19PS: Hydrogen peroxide, H2O2(aq), decomposes to H2O() and O2(g) in a reaction that is first-order in H2O2...
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A certain decomposition reaction is first order with a rate constant of 6.85*10-4 s-1 at 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
OR
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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