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Magnesium has three naturally occurring isotopes with masses of 23.99, 24.99, and 25.98 amu and natural abundances of 78.99%, 10.00%, and 11.01%, respectively. Calculate the atomic mass of magnesium. Express the atomic mass in atomic mass units to two decimal places.

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joseaaronlara

Answer:

The answer to your question is: 24.31 amu

Explanation:

Magnesium isotopes      1  mass 23.99 abundance 78.99%

                                         2 mass 24.99    abundance    10.00%

                                        3  mass 25.98    abundance    11.01 %

Atomic mass of magnesium = ((23.99x0.7899) + (24.99 x 0.10) + (25.98x0.1101)

Atomic mass of magnesium = 18.95 + 2.5 + 2.86

Atomic mass of magnesium = 24.31 amu

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