The Law of Conservation of Mass

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-Established in 1789 by French Chemist Antoine Lavoisier

-States that mass is neither created nor destroyed in any ordinary chemical reaction.



*Or more simply, the mass of substances produced (products) by a chemical reaction is always equal to the mass of the reacting substances (reactants).



​*This is important because when we try to balance equations because matter cannot go anywhere so the two sides must have the same number of atoms.