If the average atomic mass ( m a) or average molecular mass is known, we can convert it into the molar mass ( M) with the help of the molar mass constant ( M u). It could vary from sample to sample depending on the percentages of constituents in the sample. ![]() This is true for all atoms of carbon-12 in the universe. For example, the atomic mass of carbon-12 is 12 u. The atomic mass is constant for a particular isotopic element. The existence of isotopes is accounted for since it is a bulk property. G mol −1 is the standard unit for the molar mass. It has a unit of the unified mass unit (u) or the atomic mass unit (amu). The atomic mass is the sum of the mass of protons, neutrons, and electrons. Table 1: Difference between Atomic Mass and Molar Mass Atomic Mass The table below describes the differences between the two. But they are two different quantities with a definition. The atomic mass and the molar mass are confused with one another.
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