Which scientific law relates to the conservation of mass during a chemical reaction?

The Law of Conservation of Mass states that in a closed system, the total mass before a chemical reaction is equal to the total mass after the reaction. This principle implies that matter cannot be created or destroyed during a chemical transformation; it simply changes forms or combines in different ways. Therefore, the number of atoms and the mass of reactants must equal the number of atoms and mass of products. This law is fundamental to understanding chemical reactions, as it allows scientists to predict the outcomes of reactions based on the quantities of reactants used and products formed.

The other options pertain to different principles in physics and chemistry. Newton's First Law relates to the motion of objects and inertia rather than chemical processes. The Conservation of Energy deals with energy transformations, not directly with mass. Boyle's Law describes the relationship between the pressure and volume of a gas at constant temperature, which is unrelated to mass conservation in chemical reactions.