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29 March, 03:24

An element has three stable isotopes. One has a mass number of 63 and an abundance of 50%. The second has a mass number of 65 and an abundance of 30%. The third has a mass number of 67 and an abundance of 20%. Calculate the relative atomic mass of this element. Give your answer to one decimal place.

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  1. 29 March, 04:39
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    63x1/2 + 65x0.3 + 67x1/5

    =

    64.4 average atomic mass
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