A generic element, G, is composed of two isotopes, 132G and 128G. 132G has a natural abundance of 90% and an isotopic mass of 131.90 amu, and 128G has a natural abundance of 10% and an isotopic mass of 127.90 amu. What is the average atomic mass of this element?

The average atomic mass of this element is 131.5 amu

Explanation:

Mass of isotope 1 = 131.90 amu

% abundance of isotope 1 = 90% =

Mass of isotope 2 = 127.90 amu

% abundance of isotope 2 = 10% =

Formula used for average atomic mass of an element :

The average atomic mass of this element is 131.5 amu

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the answer is c

tell me if wrong