Atomic Structure Question
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Mg has three different isotopes. Mg-24 has an abundance of 78.70%, Mg-25 has an abundance of 10.13%, and Mg-26 has an abundance of 11.17%. Which setup is correct for calculating the atomic mass of magnesium?
- (78.70)(24 u)+(10.13)(25 u)+(11.17)(26 u)
- (78.70)(24 u)+(11.17)(25 u)+(10.13)(26 u)
- (0.7870)(24 u)+(0.1013)(25 u)+(0.1117)(26 u)
- (0.7870)(24 u)+(0.1117)(25 u)+(0.1013)(26 u)