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On a mission to a newly discovered planet, an astronaut finds gallium abundances of 61.29% for 69Ga and 39.71% for 71Ga . What is the atomic mass of gallium for this location? The mass of 69Ga is 68.7200amu
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On a mission to a newly discovered planet, an astronaut finds gallium abundances of 61.29% for 69Ga and 39.71% for 71Ga . What is the atomic mass of gallium for this location?

The mass of 69Ga is 68.7200amu . The mass of 71Ga is 70.9200amu .

User Dog Eat Cat World
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To solve this, we multiply the each mass of the isotope by the percentage of abundance of each isotope.

average molecular weight = 0.6129(68.72amu) + 0.3971(70.92) = 70.28 amu
User Dawid Kruk
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