Sodium only has one naturally occuring isotope, 23 Na, with a relative atomic mass of 22.9898 u. A synthetic, radioactive isotope of sodium, 22 Na, is used in positron emission tomography. 22 Na has a relative atomic mass of 21.9944 u.
A 2.4476 g sample of sodium containing a mixture of 23 Na and 22 Na has an apparent "atomic mass" of 22.9686 u. Find the
mass of 22 Na contained in this sample.
mass of 22Na:

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Why are people not able to skip a dive to the deepest part of the ocean