t (s) [A] (M) In[A] 1/[A] 0.00 0.500 -0.693 2.00 20.0 0.389 -0.944 2.57 40.0 0.3
ID: 685823 • Letter: T
Question
t(s) [A]
(M) In[A] 1/[A] 0.00 0.500 -0.693 2.00 20.0 0.389 -0.944 2.57 40.0 0.303 -1.19 3.30 60.0 0.236 -1.44 4.24 80.0 0.184 -1.69 5.43 This is a first order reaction, What isthe value of the rate constant for this reaction? t
(s) [A]
(M) In[A] 1/[A] 0.00 0.500 -0.693 2.00 20.0 0.389 -0.944 2.57 40.0 0.303 -1.19 3.30 60.0 0.236 -1.44 4.24 80.0 0.184 -1.69 5.43 This is a first order reaction, What isthe value of the rate constant for this reaction? t
(s) [A]
(M) In[A] 1/[A] 0.00 0.500 -0.693 2.00 20.0 0.389 -0.944 2.57 40.0 0.303 -1.19 3.30 60.0 0.236 -1.44 4.24 80.0 0.184 -1.69 5.43
Explanation / Answer
Plot ln[A] vs t ln[A] = ln[A]0 - kt (this isfirst order reaction eqn) The slope will be -k Slope is -0.02631 s-1 (EXCEL regression). This isobtained by a linear fit to t ln[A] 0 0.693 20 -0.944 40 -1.19 60 -1.44 80 -1.69 So k = 0.02631 s-1
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