Answer :
Final answer:
The average atomic mass of magnesium is calculated by taking a weighted average of the masses and abundances of its three isotopes (Magnesium-24, Magnesium-25, and Magnesium-26). The calculation results in an approximate atomic mass of 24.305 amu.
Explanation:
The average atomic mass of magnesium can be calculated by taking into account the different masses and abundances of its naturally occurring isotopes. Specifically, these three isotopes are Magnesium-24, Magnesium-25, and Magnesium-26. The weighted average of these isotopes can be calculated using the formula: (mass1 * abundance1) + (mass2 * abundance2) + (mass3 * abundance3). Abundance should be expressed as a decimal value in this formula.
So, for magnesium, it would be: (23.985 amu * 0.7899) + (24.986 amu * 0.1000) + (25.982 amu * 0.1101). Doing this calculation gives us an average atomic mass of approximately 24.305 amu for magnesium.
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