A model differential equation for chemical reaction dynamics in a plug-flow reactor is as follows: u (∂C)/(∂x)=D (∂^2 C)/(∂x^2)-k C-(∂C)/(∂t) where u is the velocity, D is the diffusion coefficient, k is the reaction-rate constant, x is the distance along the reactor, and C is the (dimensionless) concentration for a given chemical in the reactor. Determine the appropriate dimensions of D and k. Using a characteristic length scale L, average velocity V, and background concentration C0 as paramete