1. Consider the following reaction was carried out in a CSTR. Adsorption: A(g)+SAS Surface reaction: AS+SBS+S Desorption: BSB+S a) Assuming the surface reaction step is the limiting step, develop a rate law for the above mechanism. b) From the rate law in (a) determine the catalyst weight of CSTR when the conversion, X= 0.55. Assuming no pressure drop occur during the reaction. The molar feed rate of A to the reactor is 25mol/min, and the reactor is operated at 40atm and 640C. Taking k=k5CT2 =8.0103mol/kgcatmin,KAD=1.39atm1,KD=1.038atm1,Ks=2.4atm1