• The law of conservation of mass states that, during a chemical reaction, the total mass of the products must be equal to the totalMass of the reactants.
  • In other words, mass cannot be created or destroyed during a reaction, but is always conserved.
  • The law was developed by chemists in the late 1700s.
  • It is based on the fact that elements combine with one another to form more complex substances called compounds.
  • The chemical and physical properties of these compounds are different than the properties of the elements from which they were formed.
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