Two gas-phase reactions occur in a packed-bed reactor, with the corresponding rate information: Reaction 1: A2B+2Cr1A=k1ACA Reaction 2: C+A3Dr2D=k2DCCCA Known values are inlet concentrations, inlet volumetric flow rate, inlet pressure, pressure drop parameter, and the rate constants k1A and k2D. A pressure drop is observed in this PBR, and the reaction is run isothermally. You want to calculate the concentrations of C and D exiting the reactor. a. What are all the equations that are needed to solve this problem? List your equations within the categories of (i) mole balance, (ii) rate law, (iii) stoichiometry, and (iv) other equations. Be as specific as possible, and briefly explain your answers in each category. b. What equation(s) would be different (from your answers in part a) if the PBR is a membrane reactor, and species C diffuses out of the reactor? Justify your answer and explain any new variables in this situation