What principle states that mass is neither gained or lost during a chemical reaction?

Name: What principle states that mass is neither gained or lost during a chemical reaction?
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Question

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The law of conservation of mass states that mass is neither gained nor lost during a chemical reaction. This means that the total mass of the reactants must be equal to the total mass of the products. This principle was first discovered by Antoine Lavoisier in the late 18th century and is a fundamental principle of chemistry.

What Principle States That Mass Is Neither Gained or Lost