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Question
Calculate the average atomic mass of naturally occurring magnesium using the following data.
| Isotope | Isotopic atomic mass | Abundance (%) |
| Mg24 | 23.99 | 78.99 |
| Mg25 | 24.99 | 10.00 |
| Mg26 | 25.98 | 11.01 |
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Solution
Average atomic mass = `((78.99 xx 23.99) + (10 xx 24.99) + (11.01 xx 25.98))/100`
= `2430.9/100`
= 24.31 u
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