18. A certain reaction has the following general form: a A → bB.
At a particular temperature and [A]_o= 2.50 x 10^-3 M, a plot of 1/[A] vs. time resulted in a straight line with a slope of 4.0 x 10^-2 L/mol,s. What's the "third" half-life (in 10⁴ s)?
(A) 5.0
(B) 1.0
(C) 2.0
(D) 6.0
(E) 4.0

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