Catalyst increases rate of reaction. Does different masses of catalyst affect rate of reaction?
It could have an effect, depending on the exact nature of the catalyst, but generally speaking only very small amounts of catalyst are needed to achieve the desired reaction. If the catalyst participates in the reaction directly but is regenerated, adding more may have an effect but the benefit of these reactions is that you only need a small amount because the catalyst is continually reformed and then reaction proceeds until all (or a lot) of the starting material is used up. A small amount of acid can be used to catalyze many reactions where a larger concentration of the acid lead to unwanted byproducts. Catalysts sometimes work by providing a surface or structural support that encourages a particular reaction (examples include many metal catalysts in organic chemistry and some enzymatic reactions). In this case increasing the surface area of the catalyst might speed things up.
