A useful model of interfacial mass transport makes three assumptions:

(i) there is a difference between the concentrations of A at the interface, C_A denoted C_A in Phases I and II, respectively, and the bulk concentrations.

(ii) the rates of transfer in each phase are proportional to the differences between the bulk an interfacial concentrations:

(iii) the interfacial concentrations are in equilibrium:

(A) Show that the equation

(B) Find the limit of Km in the following cases:

(C) What is the physical significance of the two limits in part (B)?