Consider the following gas reaction of A₂ ( shaded spheres) and B₂ ( unshaded spheres)
A₂ (g)  +  B₂ (g)  ⇌  2 AB (g) 
Which container proceeds more to completion? 

• A. A
• B. B

Answer: (B)

Verified step by step guidance

1. Identify the initial reactants and products in the reaction: A2 (shaded spheres) and B2 (unshaded spheres) are the reactants, and AB (a combination of one shaded and one unshaded sphere) is the product.
2. Examine container A: Count the number of A2, B2, and AB molecules. Note the number of each type of molecule to determine the extent of the reaction.
3. Examine container B: Similarly, count the number of A2, B2, and AB molecules. Compare these numbers to those in container A.
4. Determine which container has more AB molecules relative to the initial amounts of A2 and B2. The container with more AB molecules indicates a greater extent of reaction completion.
5. Conclude which container proceeds more to completion by comparing the relative amounts of AB formed in each container. The container with the higher conversion of reactants to products is the one that proceeds more to completion.