🤓 Based on our data, we think this question is relevant for Professor Jablonsky's class at UAB.
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