Question. Natural Gallium consists of two isotopes, with atomic masses 69 and 71 in the atomic ratio of 3: 2 respectively. Calculate the relative atomic mass of Gallium. (2mks)
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Percentage abundance of isotope 1 is 60% and isotope 2 is 40% (you have to multiple the ratio by 20)
Then evaluation
(69×60/100) + (71×40/100)
41.4+28.4
69.8
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