Unit of Km is:
The Km is the substrate concentration at 1/2 Vmax. As Km is the concentration, unit of Km will be the unit of concentration Km is a measure of a substrate's affinity for the enzyme. It is inversely propoional to the affinity.
second-1
Moles second-1
Millimoles
Millimoles Litre-1
Enzyme kinetics