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1 September, 11:04

Rubidium is a soft, silvery-white metal that has two common isotopes, 85Rb and 87Rb with masses of 84.904 and 87.099 respectively. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of Rubidium? Submit your answer with three decimal places.

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  1. 1 September, 11:58
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    To find the average atomic mass of an element, you use the formula:

    AAM = %X1*m1 + %X2*m2 + ... + %Xn*mn

    With %X the abundance of an atom/isotope, m the mass of the atom/isotope

    (n being the number of isotopes you need to consider)

    So this formula gives us:

    AAM = 72.2% * 84.904 + 27.8% * 87.099

    = 85.514
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