3. A CSTR is often chosen as a flow reactor for liquid phase reactions. A solution containing an ester R.COOR', is to be hydrolysed with an excess of caustic soda solution NaOH. Two CSTRs of equal size in series are used to achieve the desired conversion. The ester and caustic soda solution flow separately into the first tank at rates of 0.004 and 0.001 m/s and with concentrations of 0.02 (for the R.COOR' solution) and 1.0 (for the NaOH solution) kmol/m. The reaction: R.COOR'(l) + NaOH(l) R.COONa(1) + R'OH(1) is follows the elementary rate law with a rate constant equal to 0.033 m/(kmol.s) at the temperature at which both tanks operate. At the end of the 2nd reactor a conversion of ester (based on the inlet concentration to the first reactor) of 0.95 is achieved. Determine the size (volume) of the reactor in m