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By definition, a mole of any substamce contains 6.022142 x 1023 molecules. This constant, known as the Avogrado constant, is how we convert atomic weight to grams. If you know the atomic weight of, say, oxygen is 15.9994, then one mole of oxygen weighs 15.9994 grams. Anyway, one mole of NaHCO contains 6.022142 x 1023 molecules, but each molecule contains four atoms (one each of Sodium, Hydrogen, Carbon, and Oxygen). So the total number of atoms in a mole of NaHCO is 4 x 6.022142 x 1023 = 2.408857 x 1024.

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