APFIVE Calculating Average Atomic Mass
A newly discovered element has three isotopes with masses 142.1, 143.1, and 144.1 amu. If the mass spectrum shows peaks with relative intensities in the ratio 2:3:1, what is the element’s average atomic mass?
A
143.1 amu
B
143.4 amu
C
142.9 amu
D
143.0 amu
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