Answers: 2
![[A_t]=[A_0]e^{-kt}](/tpl/images/0431/0796/1ef89.png)
![[A_t]](/tpl/images/0431/0796/5262c.png)
is the concentration at time t
![[A_0]](/tpl/images/0431/0796/9a686.png)
is the initial concentration
![\frac {[A_t]}{[A_0]}=e^{-0.04621\times 48}](/tpl/images/0431/0796/96ef3.png)
![\frac {[A_t]}{[A_0]}=0.10881](/tpl/images/0431/0796/b1cfc.png)
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