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2 May, 19:53

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%. Calculate the atomic mass of magnesium.

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  1. 2 May, 19:54
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    24.309

    Explanation:

    Let A, B, and C represent the three isotopes.

    For isotope A:

    Mass number = 23.99

    Abundance = 78.99%

    For isotope B:

    Mass number = 24.99

    Abundance = 10.00%

    For isotope C:

    Mass number = 25.98

    Abundance = 11.01%

    Atomic mass of Mg = ?

    Atomic mass = [ (Mass of AxA%) / 100] + [ (Mass of BxB%) / 100] + [ (Mass of CxC%) / 100]

    Atomic Mass = [ (23.99x78.99) / 100] + [ (24.99x 10) / 100] + [ (25.98x11.01) / 100]

    Atomic number = 18.950 + 2.499 + 2.860

    Atomic mass of Mg = 24.309
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