Question

The unit for the rate constant is calculated from the rate law.
For the given rate law, determine the units of the rate constant for rate $=k\left[A{]}^2\right[B]$.

• A. $s^{-1}{M}^{-3}$
• B. $s^{-1}{M}^{-2}$
• C. $s^{-1}{M}^{-1}$
• D. $s^{-1}$

Answer 1

Answer: (B)

$s^{-1}{M}^{-2}$

Since rate constant is given by $k\left[A{]}^2\right[B]$.
Where 1+2=3, so it is probably third order reaction.
So rate constant should have units of $L^{2}mo{l}^{-2}{s}^{-1}⟹M^{-2}{s}^{-1}$