Question

What are the units of rate constant for a reaction of order n?

Answer 1

For the general reaction 

\[\ce{aA + bB + cC -> Products}\],

if the rate law is

Rate = k[A]^p [B]^q [C]^r and

p + q + r = n,

we have Rate k = [concentration of reactants]ⁿ

Thus, `k = "Rate"/"[conc. of reactants]"^n`

= `(mol L^-1 s^-1)/(mol L^-1)^n`

= (mol L⁻¹)^{1 − n} s⁻¹