(15%)A second-order irreversible reaction (A+BD) has a specific reaction rate of 6m3/(molhr) at 500K. An ideal gas mixture is charged to a tubular reactor at a rate of 1104mol/hr, with the feed composition of 40%A,40%B, and 20% inert. The reactor is operated isothermally at 500K and the pressure is 6atm. The reactor is 10cm in inner diameter. (R=0.082(Latm)/(molK)) (1) What reactor length is necessary for 80% conversion? (2) What is the mean residence time of the gases? A: (1) 58m(2)8.64103hr