Question

11. Calculate the number of atoms in each of the following
(i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He.

Answer 1

(i) 1 mole of Ar =6.022×10²³atoms of Ar

52 mol of Ar=52×6.022×10²³atoms of Ar

=3.131×10²5 atoms of Ar

(ii) Atomic mass of He = 4amu

Or

4amu is the mass of He atoms = 1

Therefore 52 amu is the mass of He atoms=0.25×52=13 atoms of He

(iii) Gram atomic mass of He = 4g

Or

4g of He contains =6.022×10²³atoms

Therefore 52 g of He contains=

(6.022 x 10²³) / (4 x 52) = 7.83 x 10²⁴ atoms

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