Determine the rate constant from the concentration$-$time dependence:

$\backslash$table$[[$Time $($s$),$Reactant$],[0\mathrm{.}0,0\mathrm{.}0350],[10,0\mathrm{.}0223],[20,0\mathrm{.}0142],[50,0\mathrm{.}0037],[70,0\mathrm{.}0015]]$

Use SI units, that is$,$ seconds for time $($not included in answer$).$

Answer:

Calculate the half$-$life $($in s$)$ of a first$-$order reaction if the concentration of the reactant is $0\mathrm{.}0677M11\mathrm{.}3s$ after the reaction starts and is $0\mathrm{.}0269M67\mathrm{.}5s$ after the reaction starts.

Answer:

Suppose the half$-$life is $7\mathrm{.}9s$ for a first order reaction and the reactant concentration is $0\mathrm{.}0674M23\mathrm{.}7s$ after the reaction starts. How many seconds after the start of the reaction does it take for the reactant concentration to decrease to $0\mathrm{.}0115M?$

Answer