Chemistry Practice Problems Identifying Reaction Order Practice Problems Solution: Consider the data presented below. Time  (s) 04080...

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Solution: Consider the data presented below. Time  (s) 04080120160Moles of A0.1000.0670.0450.0300.020Determine whether the reaction is first order or second order.

Problem
Consider the data presented below.


 Time  (s04080120160
Moles of A0.1000.0670.0450.0300.020


Determine whether the reaction is first order or second order.

Solution

We’re being asked to determine a reaction is first order or second order based on the data given.


Recall the first order and second order integrated rate law and their graph:

The integrated rate law for a first-order reaction is as follows:

ln[A]t=-kt+ln[A]0

where: 

[A]t = concentration at time t
k = rate constant
t = time
[A]0 = initial concentration


The plot of ln [A] vs. t is linear which shows first-order reaction:

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