We are asked to determine the half-life of a 1st-order reaction using the provided data
The integrated rate law for a 1st-order reaction is as follows:
where [N]t = concentration at time t, k = rate constant, t = time, [N]0 = initial concentration.
A → B is a first order reaction. Using the data below, what is the half-life in seconds?
0 sec, [A] = 1.22 M
3 sec, [A] = 0.86 M
6 sec, [A] = 0.61 M
9 sec, [A] = 0.43 M
12 sec, [A] = 0.31 M
15 sec, [A] = 0.22 M
18 sec, [A] = 0.15 M
a. 2.3 s
b. 2.8 s
c. 6.1 s
d. 7.8 s
e. 9.1 s
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