$($a$)$ What are the different steps involved in solid catalyzed fluid$-$phase reactions?

$($b$)$ Draw the concentration profile of reactant within the pore for distribution and average concentration of reactant in a catalyst pore as a function of $mL($Thiele modulus$)$ for a first order surface reaction.

$($c$)$ A solid catalyzed first order reaction $AR$ takes place with $55\%$ conversion in a basket type mixed reactor. Find the conversion if the reactor size is trebled$-$all else, i$.$e$.,$ temperature, composition, etc. remains unchanged.