Round 1: Naturally occurring silver exists as two isotopes. From the table above, calculate the average atomic mass of silver.
107.9 u
Round 2: Rubidium ignites spontaneously when exposed to oxygen to form Rb2O. Rubidium exists as two isotopes: Rb-85 (84.91u) and Rb-87 (86.91u). If the average atomic mass of Rubidium is 85.47u, determine the percentage abundance of Rb-85.
72%
Round 3: A small pin contains 0.0178 mol of iron (Fe). How many atoms of iron are in the pin?
1.07 x 10^22 atoms
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