Chemistry, 31.08.2019 08:30 dkjfghdjk

Anewly 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?

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Anewly discovered element, z, has two naturally occurring isotopes. 90.3 percent of the sample is an...