Calculate the number of atoms in 52 moles of he,52u of he

1.	Calculate the number of atoms in 52 moles of he,52u of he
Answer» (i) 1 mol of AR = 6.022×1023atoms ∴ 52 mol of Ar = 52×6.022×1023atoms = 3.131×1025atoms (ii) 1 ATOM of He = 4 u of He 4 u of He = 1 Atom of He ∴ 52 u of He = 1/4 × 52 = 13 atoms (iii) 1 mol of He = 4 g = 6.022×1023atoms ∴ 52 g of He = (6.022×1023/4) × 52 atoms = 7.8286×1024atoms

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