A liquid phase reaction A rightarrow B was carried out isothermally in a PFR and in a CSTR. CSTR A stream of pure A having concentration 1 k mol/dm^3 was fed into the CSTR (volume 50 dm^3) at a flow rate of 10 k moles of A/min. The conversion of A achieved was 0.5. PFR A diluted stream of A having concentration 0.5 k mol/dm^3 was fed into the PFR (volume 50 dm^3) at a flow rate of 5 k moles of A/min. Find the rate law, order and rate constant.