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Question

An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99 amu and 8.82% abundance with 21.99 amu. Calculate the average atomic mass of this element.

A
80.52 amu
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B
25.45 amu
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C
15.89 amu
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D
20.16 amu
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