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Not sure what you mean by "numerical portion," since the gram-atomic weight is a number. Basically, gram-atomic weight (or gram-molecular weight when molecules, like CO2 or H20, are involved) is the amount of a substance in grams equal to its atomic weight. The atomic weight of an element is equal to the sum of its protons and neutrons in its nucleus. The number is often expressed as an integer: 16 for Oxygen, for example. More precisely, it is 15.9994, because of the existence of isotopes of Oxygen that have fewer neutrons in their nuclei than the most common isotope. The 15.9994 value represents the weighted average of all the atomic weights of all isotopes of Oxygen.

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