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Average Atomic Mass Worksheet Doc. 69.2% for mass of 62.93u. Using the mole to count atoms.
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The atomic mass of boron is 10.811; The other isotope, 65cu, has an abundance of 30.91%. 2) uranium has three common isotopes.
Calculate the average atomic mass.
The four isotopes of lead are shown below, each with its percent by mass abundance and the composition of its nucleus. The other isotope, 65cu, has an abundance of 30.91%. What is the average atomic mass of this sample of these two isotopes of iron? What is the average mass of lithium?
