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OpenStudy (anonymous):
A newly discovered element, X, has two naturally occurring isotopes. 93.5 percent of the sample is an isotope with a mass of 268.9 u, and 6.5 percent of the sample is an isotope with a mass of 269.9 u. What is the weighted average atomic mass for this element? 268.5 u 269.0 u 269.4 u 269.8 u
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