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A mole Chemistry uses a special unit to represent the number of particles (atoms or molecules). This unit is called a mole. Like a dozen represents 12, a mole represents 6.02 x 1023 particles. This number (6.02 x 1023) is called Avogadro’s number. Converting Number of Particles to Moles Converting Moles to Number of Particles Atomic mass units The mass of a molecule or single atom is measured in atomic mass units (amu). Atomic mass values can be found on the periodic table; for example the atomic mass of Carbon is 12.011 amu. This value expressed in grams is equivalent to 1 mole of the atom. The molar mass of Carbon is therefore, 12.011 g/mol. To calculate the atomic mass of a compound, simply add the atomic masses of the individual atoms in the compound. For example, H2O has 2 H atoms and 1 O atom, which add up respectively to a molar mass of 18.0 g/mol (1.0 + 1.0 + 16.0).