Question

If the concentration is measured in mol $L^{-1}$ and time in minutes, the unit for the rate constant of a third order reaction is:

• A. mol $L^{-1}mi{n}^{-1}$
• B. $L^{2}mo{l}^{-2}mi{n}^{-1}$
• C. $Lmo{l}^{-1}mi{n}^{-1}$
• D. $mi{n}^{-1}$

Answer 1

Answer: (B)

$L^{2}mo{l}^{-2}mi{n}^{-1}$

As we know,
$k=[conc{]}^{1-n}mi{n}^{-1}$
For third order reaction = $[mol{L}^{-1}{]}^{1-3}mi{n}^{-1}$
$L^{2}mo{l}^{-2}mi{n}^{-2}$