A batch experiment is performed in which the organic matter in a wastewater sample is

degraded by bacteria. The COD $($chemical oxygen demand$)$ of the wastewater is

measured over time after adding bacteria at time zero, giving the results shown in the

table below. Assuming the degradation is first$-$order with respect to the COD

concentration, determine the first$-$order rate constant $k$ in units of $mi{n}^{-1}.$ Round your

answer to $3$ digits past the decimal $($e$.$g$.,$

X$.$XXX$)$ and do NOT enter units.