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 $5$ s$?s^{-1}$

What is the value of $k$ at $10s?00\mathrm{.}080s^{-1}$

What is the value of $k$ at $15s?s^{-1}$

What is the value of $k$ at $25s?$

$s^{-1}$

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

What is the value of $k$ at $5s?M^{-1}{s}^{-1}$

What is the value of $k$ at $10s?M^{-1}{s}^{-1}$

What is the value of $k$ at $15s$

$M^{-1}{s}^{-1}$

What is the value of $k$ at $25s?$

$M^{-1}{s}^{-1}$

$($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 $2)$

$($D$)$ What is the concentration of $A$ at time $t=61s?$