Calculate the number of atoms in 52 u of He.

1 mole =6.022×10^23 atoms

One mole of He = 4u

Number of moles in 52 u of He = 52/4 = 13 moles

Number of atoms in 13 moles = 13× 6.022×10^23 = =7.8286 × 10^24.

Therefore 52 u of He has 7.8286 × 10^24 atoms.

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