The following batch data are available for a liquid phase reaction A->R.

CA(moles/L) 0.1 0.2 0.3 0.4 0.6 0.8 1.2

-rA (moles/L-min) 0.1 0.3 0.5 0.6 0.25 0.06 0.045

(a) How long will it take for the concentration to decrease from 1.2 to 0.2 moles/L?

(b) The same reaction is to be carried out in a plug floe reactor of unknown volume followed by a mixed flow reactor of 25L volume connected in series. The specifications of the feed stream is as follows:

Total flowrate = 750 L/h, concentration of A in the feed = 1.0moles/L. If 80% conversion of A is required from the above PFR-MFR combination, what size of plug flow reactor would be needed