The reaction 2 A + B2 2 AB follows this mechanism:
Step 1: A + B2
AB + B (slow)
Step 2: A +B
AB (fast)
What is the order with respect to [B2] in the overall reaction?

A. sigma your welcome

The rules are different for multiplication and addition, but the least precise value always restricts the answer. first do the multiplication (as per standard order of operations): 24.6681 × 2.38 ≈ 58.7 since 2.38 has the fewest significant figures, it is considered the lease precise value then do the addition: 58.7 + 332.58 ≈ 391.3 since 58.7 has fewest figures right of decimal it is considered least precise. so final answer: 391.3 with four significant figures.