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An element has two stable isotopes. One has a mass of 6.015 amu and is 7.59 abundant. The second has a mass of 7.016 amu and is 92.41 abundant what is the average mass of the element. What is the average atomic mass of the element
For isotope 1 (lithium-6), atomic mass = 6.015 × 7.59 / 100 = 0.4565385 6.015×7.59/100=0.4565385 For lithium-7, atomic mass = 7.016 × 92.41 / 100 = 6.4834856 =7.016×92.41/100=6.4834856 Average atomic mass of lithium = 0.4565385 + 6.4834856 = 6.9400241 a m u =0.4565385+6.4834856=6.9400241amu
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