The equation for the reaction is

2S(g) + 3O2(g) ---> 2SO3(g)

Consider a mixture of sulfur atoms and dioxygen molecules in a closed container below:

For each of the following explain why the representation is correct or incorrect. (Click on a diagram for an answer.)

This choice can not be correct because no product molecules have been formed. The diagram simply depicts a heterogeneous mixture of the reactants. The chemical reaction indicates the products are different compared to the reactants.