~Solution :-
Here, we have been given the the amount of helium to be 52 amu.
Thus,
- Atomic mass of Helium is 4u = 2 protons + 2
- Neutrons = 1 atom.
- No. of atoms in 52u = $ \sf{\frac{52}{4}}$ = 13 atoms.
$ \red{\leadsto}$ Hence, the number of atoms will be 13 atoms.
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