Which of the following explains that during a chemical reaction, the sum of masses of the reactants and products remains unchanged?
Law of Conservation of Mass
The Law of Conservation of Mass states that the total mass of reactants equals the total mass of products in a chemical reaction.
The Law of Periodicity, Definite Proportions and Definite Composition describe other chemical principles, not mass conservation during reactions.
Hence, Law of Conservation of Mass is the correct answer.
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