Final answer:
The catalyst in the Haber process is finely divided to increase surface area and enhance the reaction rate.
Step-by-step explanation:
In the Haber process, the catalyst is finely divided because it increases the surface area of the catalyst, allowing for more reactant molecules to come into contact with the catalyst. This increases the rate of the reaction. The increased surface area also helps to maximize the efficiency of the catalyst, as it provides more active sites for the reactant molecules to bind and undergo the reaction.