$6\mathrm{.}21M).$ The initial concentration of $A$ is the value at $t=0s.$

$($A$)$Calculate the values of the rate constant $k$ assuming that the reaction is first order.

What is the value of $k$ at $5s?0\mathrm{.}08905,s^{-1}$

What is the value of $k$ at $10s?0\mathrm{.}089,s^{-1}$

What is the value of $k$ at $15s?0\mathrm{.}08904s^{-1}$

What is the value of $k$ at $25s?0\mathrm{.}089$

$($B$)$ Calculate the value of $k$ assuming that the reaction is second order.

$($C$)$ Use your results from parts A and $B$ above to decide what the order of the reaction is for your data. $($Enter $1$ or $2)1$

$($D$)$ What is the concentration of $A$ at time $t=53s?0\mathrm{.}1008M$