Units of Basic Rate Constants - Rate Expression & Units of k

The units of k depend on the reaction order. To ensure the rate has units of concentration/time (e.g., mol/L·s), units of k vary:

Reaction Order	Rate Expression	Units of k
Zero	Rate = k	mol·L⁻¹·s⁻¹ or concentration/time
First	Rate =	s⁻¹ or time⁻¹
Second	Rate =	L·mol⁻¹·s⁻¹ or concentration⁻¹·time⁻¹v