For the following elementary aqueous phase reactions (D is a desired product and U is undesired) k1 A D k2 A U K3 DU 1) Write down the expression for instantaneous selectivity to D (SD) and U (SU). 2) If k = 10k2 and k = 2k3, and we start the reaction with pure A (CA0 = 1 mol/liter), determine SD and Su in terms of CA and CD. 3) Determine the total selectivity to U for a CSTR reactor in terms of CA and CD. 4) For a PFR, write down an expression for the total selectivity to U in terms of Su (complete analytical solution is not required). 5) Do you expect the total selectivity to U to be higher in a PFR or a CSTR at fractional conversion of A = 50%. Justify your answer based on the expressions you got and 4. 6) If k = 2k2 and k = 20k3, will the total selectivity to U be higher in a PFR or a CSTR? Explain your answer based on the expressions for selectivity in both reactors.