9. The variation of a with pressure at a chosen temperature is called the adsorption isotherm Ag+M(surface) = AM(surface) ka for adsorption rate constant and ka for desorption rate constant. The rate of change of the surface coverage, due to adsorption is proportional to the partial pressure p of A and the number of vacant sites N(1 - 0), where N is the total number of sites: (1)For adsorption process, de/dt> (2 points) (2)For desorption process, de/dt- (2 points) (3)At equilibrium there is no net change (that is, the sum of these two rates is zero). Therefore, a gives the Langmuir isotherm: 0= if a=K/Kd. (2 points)