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OpenStudy (anonymous):

Determine the average atomic mass of helium, which has two isotopes having atomic masses 4.0026 amu and 3.0160 amu. The relative abundance of the two isotopes is 99.9999 percent and 0.0001 percent, respectively.

OpenStudy (jfraser):

take the weighted average of those 2 isotopes with the percentages of each and you'll get the average atomic mass of helium

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