Chemistry, 27.09.2019 23:30 mhayslett

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a newly discovered element, z, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267.8 u, and 9.7 percent of the sample is an isotope with a mass of 270.9 u. what is the weighted average atomic mass for this element?
268.1 u
269.0 u
269.4 u
270.6 u

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