Write the unit of the rate constant for the following reactions:
$1.$ Fourth order
$2.$ Third order

(N/A) The general formula for the unit of the rate constant $(k)$ for a reaction of order $n$ is given by:
Unit of $k = (mol \ L^{-1})^{1-n} \ s^{-1}$
$1.$ For a fourth order reaction $(n = 4)$:
Unit of $k = (mol \ L^{-1})^{1-4} \ s^{-1} = (mol \ L^{-1})^{-3} \ s^{-1} = mol^{-3} \ L^3 \ s^{-1}$
$2.$ For a third order reaction $(n = 3)$:
Unit of $k = (mol \ L^{-1})^{1-3} \ s^{-1} = (mol \ L^{-1})^{-2} \ s^{-1} = mol^{-2} \ L^2 \ s^{-1}$