The gas-phase reaction a > 3b is conducted isothermally in a cstr. when pure a is used as the feed a conversion of 80% is obtained with a residence time of 20 min. (based on feed flow rate). (a) assuming a zero order reaction, determine the expected conversion if an inert diluent was used to reduce the feed concentration to 50% of the value for pure a, keeping a 20 min. residence time. what residence time would you instead suggest? (b)repeat (a) for half order reaction.