We’re being asked to calculate the average atomic mass of magnesium. We can use the following equation:
where atomic mass = average atomic mass of the element and f.a. = fractional abundance of the isotope. To get f.a., we simply need to divide the given percent abundance by 100.
How do you calculate the average atomic mass of magnesium, given the following percent abundances and isotopic masses:
10.00%. 25Mg(24.98584 u),
and 11.01%. 20Mg(25.98259 u)
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