How the Law of Conservation of Matter and Energy is conserved during these processes based on the numbers of molecules of the reactants and products?

Explanation:

The law of conservation of matter states that in any given system that is closed to the transfer of matter, the amount of matter in the system stays constant.

The law of conservation of matter says that in chemical reactions, the total mass of the products must equal the total mass of the reactants.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.