solve now please

problem 2 ( 15 points): As stated in problem 2 , a tubular packed reactor is used to remove trace amount of benzene gas from a waste gas stream by passing it over a packed bed. Currently only 35% is being accomplished, but it is believed that removal rate could be changed if the flow rate were increased by a factor of 6 , the particle diameter was decreased by a factor of 2 , and the packed bed length were increased by a factor of 2 . If you vary the parameters as suggested, by what factor does the residence time change? Would the reaction still be external diffusion controlled? If the reaction is now surface reaction controlled, name two other variables that you can modify to change the reaction rate and whether you would increase decrease them