Magnesium has three naturally occurring isotopes with masses of 23.99 amu, 24.99 amu, and 25.98 amu and natural abundances of 78.99%, 10.00% and 11.01% respectively. How do you calculate the atomic mass of magnesium?

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Answer 1 · 2016-09-12T14:35:49

Approx. #24.3" amu"#.

The atomic mass is the weighted average of the individual isotopic masses:

#(23.99xx78.99%+24.99xx10.00%+25.98xx11.01%)*g=24.31*g#

I have given you answer in #g# which here is equivalent to #"amu"#.