a)
[A]= [A]0 e^-kt
Time t = 1.0 h = 60 min and [A]0= 1.0*10^3 cells /L and k = 0.035 min-1
[A]= [A]0 e^-kt
[A]= 1.0*10^3 cell / Le^-0.035 min-1 *60 min
[A]= 1.0*10^3 cell / Le^-2.1
[A]= 1.22*10^2 cell / L
(b)
ln[A]= -kt + ln[A]0
ln4.0*10^3 cells /L = ln 1.0*10^3 cells /L -kt
8.294 = 6.91 -0.035 min-1 t
0.035 min t =1.386
t=39,61 min
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