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(5 points ) In nature, gallium consists of two isotopes, gallium -69 (mass )=( 68.926 amu and 60.1% natural abundance ) and gallium - 71

(5 points ) In nature, gallium consists of two isotopes, gallium -69 (mass )=( 68.926 amu and 60.1% natural abundance ) and gallium - 71 (mass )=(70.925 amu and 39.9% natural abundance ). Calculate the weighted average atomic mass of gallium

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