4. (a) The following data have been reported as a result of our effort to determine the distribution of residence time in packed bed reactor. Time, t, min | 0 4 8 12 16 20 24 28 32 Effluent tracer Conc., gL 0 2 3.5 4.5 5.5 4.6 3.4 2.1 O Plot C(t), E(t) and F(t) curve. Then calculate the mean residence time and find the fraction of material that Page 1 of has spent time between 12 minute and 16 minute in the reactor. (b) In the absence of pore diffusion resistance, a particular first order gas phase reaction proceeds as below: 10mol at CA=10 mol/cm' at 1 atm and 400 C. cm3cats What size if spherical catalyst pellet (D.=10 cm /cm cat.s) would ensure that pore resistance effect do not intrude to slow the rate of reaction. me nhono ronation gorriod Thrimanol dat in identalarial nt n