Problem: 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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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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