The first has a mass of 56.9707 amu and makes up 36.1 % of a standard sample. The second isotope has a mass of 58.0791 amu and makes up 21 % of a standard sample. The third isotope has a mass of 59.6217 amu.what is the atomic mass of the element?
You have to mutiply the percentages (expressed in decimals) by amu and add them up
56.907 x 0.361 + 58.0791 x 0.21 + 59.6217 x 0.429
= 20.56642 + 12.19661 + 25.5771= 58.34074
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