Final answer:
The question seems to require knowledge of specific material testing standards for concrete compaction that are not provided in the reference material, thus making it impossible to give a definitive answer about the weight of the mallet.
Step-by-step explanation:
The question refers to a procedure involved in material testing, specifically in the compaction of concrete where a mallet must be used. To answer the question about the weighing of the mallet required to tap the sides of the bowl after rodding each layer, one would need to refer to specific standards or guidelines that are not provided in the reference material. The reference material instead discusses the mass of objects like a rod and lead weights, which relate to principles of physics and can be part of experiments to study force and balance, but do not directly answer the question posed. Without such a guideline or standard, I am unable to provide a definitive answer.