Formula, Mole, and Density

    Empirical Formula

      A formula that simply gives the ratio of the number of atoms of each element in a compound.

        Example: The empirical formula of hydrogen peroxide, H2O2, is HO.

    Molecular Formula

      A formula that gives the actual numbers of atoms of each element in each molecule of a compound.

        Example: The molecular formula of hydrogen peroxide is H2O2.


      A mole is a measure of the number of atoms, molecules, or ions there are present. One mole of particles is 6.02 x 1023 particles (Avogadro's number).

      Number of moles = mass in grams / molecular weight


      Density = mass / volume

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