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2 February, 01:01

A newly discovered element, Y, has two naturally occurring isotopes. 87.8 percent of the sample is an isotope with a mass of 267.8 u, and 12.2 percent of the sample is an isotope with a mass of 269.9 u. What is the weighted average atomic mass for this element?

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  1. 2 February, 01:28
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    (0.878) (267.8) + (0.122) (269.9) =

    268 u (three sig fig)

    Check my calculations
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