5. a) Illustrate the detailed steps in theoretical process modelling with the help of a diagram (10) b) Consider a nonisothermal continuous stirred tank reactor (CSTR) shown in figure below, in which a first-order, irreversible chemical reaction A B(with a reaction rate constant k) is taking place. PEN! A-3 db Well Volurne. V T Feed material containing Caf moles/volume of A enters the reactor at temperature T's, and constant volumetric flowrate F. Product is withdrawn from the reactor at the same volumetric flowrate F. The mixing is assumed to be efficient enough to guarantee homogeneity of the liquid content within the reactor. This means that composition and temperature are uniform throughout the reactor and that the exit temperature, T, and composition ca, will be the same as within the reactor. Given the Arhenius relation that k = koe-E/RT?, derive two equations that constitute the mathematical model for this process