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

User Agabrys
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I'm not sure if what this question is asking but ill be assuming that the average molecular mass is required. An assuming that the abundance of each isotope is 50% the average molecular mass is 69.82 amu. 
User Sam Miller
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