Chapter 3, Problem 3.29CP

The reaction of A (red spheres) with B (blue spheres) is shown in the following diagram:

Which equation best describes the stoichiometry of the reaction?

(a) ${\text{A}}_{\text{2}}\text{+2B }\to {\text{A}}_{\text{2}}{\text{B}}_{\text{2}}$ (b) ${\text{10A+5B}}_{\text{2}}\to {\text{ 5A}}_{\text{2}}{\text{B}}_{\text{2}}$

(c) ${\text{2A+B}}_{\text{2}}\to {\text{A}}_{\text{2}}{\text{B}}_{\text{2}}$ (d) ${\text{5A+5B}}_{\text{2}}\to {\text{5A}}_{\text{2}}{\text{B}}_{\text{2}}$