The law of conservation of mass maintains that in all chemical reactions mass is conserved, this ensures that chemical reactions are balanced.
It is a principle of chemistry that states that the quantities of the masses involved in a given reaction must be constant, that is, the quantity of reactants consumed is equal to the quantity of products formed.
Therefore, we can conclude that the law of conservation of mass is the one that holds that, within a closed system, the amount of matter before and after a transformation is always the same.
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