(3) Chemical Equilibrium (30 pts) 1 mol/s of a species A is fed into a continuous gas phase reactor. The following two fast equilibrium reactions take place in the reactor, which

operates at 298 K and a pressure P: A B + C + D Ka,R1 = 0.375 atm² A+B= E + C Ka, R2 = 3 The output of the reactor is assumed to be at equilibrium. The selectivity of the desired product D with respect to the undesired product E (SD/E) is 2:1. Organize (a) (b) Analyze (c) Solve R1: (d) (e) R2: Draw a process flow diagram and label all stream and system variables. (4 pts) Write down three auxiliary equations in terms of the variables you wrote down in your process flow diagram only. (6 pts) Perform DOF analysis using the table on the right (3 pts) Reactor IstrV " IsysV #Vars SF+SC Specified System vars. AUX MB DOF Write down all material balances, including the total material balance. (12 pts) Solve to determine the fractional selectivity for the formation of D from A (3 pts) (f) Determine the reactor pressure P (2 pts)