Relative and Average atomic mass 1. Calculate the relative atomic mass of chlorine-37. 2. Calculate the relative atomic mass of Lead-207. 3. Gallium occurs in nature as 2 isotopes. Gallium-69 and gallium-71 with the abundance of the two 60.108% and 39.892% respectively. What is the average atomic mass of gallium? 4. Iron has 4 naturally occurring isotopes: Iron-54 (5.91%), Iron-56 (91.72%), Iron-57 (2.10%), and Iron-58 (0.28%). Calculate the average atomic mass of iron. 5. Three silicon isotopes occur in nature, silicon-28, silicon-29, and silicon-30. What is the average atomic mass of silicon if the abundances of each are 92.21%, 4.70%, and 3.09% respectively? 6. Calculate the average atomic mass of neon given the following information: Neon-20 (90.9%), Neon-21 (0.3%) and Neon-22 (8.8%) 7. If the only two naturally occurring isotopes of silver, silver-107 and silver-109, have relative atomic masses of 106.905 u and 108.905 u, respectively, what must be the average atomic mass if the abundance of silver-107 is 51.839%? 8. Calculate the average atomic mass of titanium. The five titanium isotopes have relative atomic masses and abundances of 45.953 u; 8.0%, 46.952 u;7.30%, 47.948 u;73.8%, 48.948 u; 5.50%, and 49.945 u; 5.4%.
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