How would adding the catalyst nitrogen monoxide (NO) affect this reaction? 2SO2(g) + O2(g) → 2SO3(g)

A) NO increases the rate at which SO3 molecules are formed.

B) NO reacts with SO3 to produce more SO2 molecules.

C) NO decreases collisions between the SO2 and O2 molecules.

D) NO increases the concentration of the SO2 and O2 molecules.

E) NO increases the activation energy of the SO2 and O2 molecules.

A) NO increases the rate at which molecules are formed.

Explanation:

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more reactant molecules can cross the energy barrier by undergoing collisions and convert to products.

Thus NO will increase the rate of reaction by lowering the activation energy and thus the colllisions among and molecules will incraese which in turn will lead to formatioon of more molecules.