Question

The mass of an atom of sodium is 23 u. Calculate the
number of sodium atoms in 1 mg.
Take 1 u = 1.66 x 10-27 kg.
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Answer 1

Answer:

When you look at a periodic table of the elements, you see that sodium has an atomic weight of 23. This means that a single atom of sodium weighs 23 atomic mass units (AMUs), but it also means that one mole of sodium atoms weighs 23 grams. Hence 6.02 x 10^23 atoms of sodium weight a total of 23 grams.