To calculate the time required for a $99\mathrm{.}9\%$ kill for a chlorine dosege of $0\mathrm{.}05m\frac{g}{L}$ at temp of $20C$ and $PH$ of $8\mathrm{.}5$ using the data and relation ship developed in the frevious example CAssume activation energy $E=26800\frac{J}{g}mo\frac{l}{k}$

Use the following relationship

$ln(\frac{N_t}{N_0})=-10\mathrm{.}48c^{1\mathrm{.}20}t$