2. The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are 69.2% for a mass of 62.93 amu and 30.8% for a mass of 64.93 amu. How do you calculate the average atomic mass of copper?

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Answer 1 · 2016-09-09T19:47:16

The average atomic mass is simply the weighted average of the individual isotopes.

And thus the #"weighted average"# is:

#(62.93xx69.2%+64.93xx30.8%)*"amu"# #=# #63.55# #"amu"#