The liquid-phase reaction follows an elementary rate law and is carried out isothermally in a flow system. the concentrations of the a and b feed streams are 2 m before mixing. the volumetric flow rate of each stream is 5 dm 3 /min, and the entering temperature is 300 k. the streams are mixed immediately before entering. two reactors are available. one is a gray, 200.0-dm 3 cstr that can be heated to 77 c or cooled to 0 c, and the other is a white, 800.0-dm 3 pfr operated at 300 k that cannot be heated or cooled but can be painted red or black. note that k 0.07 dm 3 /mol min at 300 k and e 20 kcal/mol.