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The average atomic mass of carbon is 12.011. This is a weighted average based on three forms (isotopes) of carbon with different natural abundances. Carbon 12 has an atomic mass of 12.00 (carbon 12...Atomic mass of Carbon is 12.0107 u. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. The unit of measure for mass is the atomic mass unit (amu) . Average atomic mass (Atomic weight): It is defined as the average mass of an element with respect to the mass of $$\frac{1}{12}$$the of an atom of the C-12 isotope. The average of an isotopic mass of all the isotopes present in the natural mixture is the atomic mass of an element. Mathematically, Solve problem: The natural isotopic abundance of 10 B is 19.60% and 11 B is 80.40 %. The exact isotopic masses are 10.13 and 11.009 respectively. Calculate the average atomic mass of boron