PLEASE HELP What is the atomic mass of the element described below? *
Calculate the elemental atomic mass of Mg if the naturally occurring isotopes are Mg. Mg and PMg. Their masses and abundances are as follows:

The atomic mass of the element = 24.309547

Given

Isotopes of Mg

Required

The atomic mass

Solution

Atomic mass is the average atomic mass of all its isotopes  

Mass atom X = mass isotope 1 . % + mass isotope 2.% ..

The atomic mass of the element(Mg) :

= 23.98504 . 0.7870 + 24.98584 . 0.1013 + 25.98259 . 0.1117

= 18.876226 + 2.531066 + 2.902255

= 24.309547

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