The element gallium has an atomic weight of 69.7 and consists of two stable isotopes gallium -69 and gallium -71.
The isotope gallium -69 has a mass of 68.9 amu and a percent natural abundance of 60.4 %.
The isotope gallium -71 has a percent natural abundance of 39.6 %.
What is the mass of gallium -71? ___________ amu
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