How many atoms do 2 moles of S₈ molecule contain?

Number of atoms(N) = Number of moles ($\mathrm{n}$) $\times {\mathrm{N}}_2\times$ atomicity
Where, N₂ = Avogadro's number = $6.023\times 10^{23}$
 

2.0 mol S₈ = 2.0 mol x 6.02x10²³ molecules/mol x 8 atoms/molecule = 9.6x10²⁴ atoms

6 mol S = 6 moles x 6.02x10²³ atoms/mol = 3.6x10²⁴ atoms

2.0 mol SO₂ = 2.0 mol x 6.02x10²³ molecules/mol x 3 atoms/molecule =3.6 x10²⁴ atoms

 44.8 L CO₂ @ STP = $\frac{44.8 \mathrm{L} \times 1 \mathrm{L}/\mathrm{dm}3 \times 1 \mathrm{mol}}{22.4 \mathrm{L}}$ 

6.02x10²³ molecules/mol x 3 atoms/molecule = 3.6x10²⁴ atoms

S₈ contains  9.6x10²⁴ atoms, the most atoms in 2 moles.