Asked by theo

A hypothetical element has two main isotopes
with mass numbers of 71 and 74. If 80.00% of
the isotopes have a mass number of 71 amu,
what atomic weight should be listed on the
periodic table for this element?
(answer in AMU).
Answered by DrBob222
I would rather see the atomic weight of each isotope; failing that I'm assuming they are 71 and 74.
0.80(71) + 0.20(74) = ?
Answered by Anonymous
71.6
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