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  • Law of Conservation of Mass-the sum of the masses of the reactants and products remains unchanged
  • Law of Definite Propotions: Elements are always present in a definite proportion by mass
  • A chemical formula of a compound shows its constituent elements and the number of atoms of each combining elements
  • An atom is the smallest particle of an element or a compound capable of independent existence under ordinary conditions. It shows all the properties of the substances
  • Clusters of atoms that act as ions are called polyatomic ions. They carry a fixed charge on them
  • The Avogadro constant 6.022*1023is defintie as the number of atoms in exactly 12g of carbon
  • A mole is the amount of substance that contains the same number of particles
  • Mass of 1 mole of a substance is called its molar mass

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