(i) 1 mole of any substance contains 6.023 × 1023 number of molecules.
S8 = 8 atoms = 8 × 32 = 256.
256 g S8 contains = 6.023 × 1023 number of molecules
So, 192 g will have = 6.023 × 10^{23}\over 256×192
= 192 \over 256 × 6.023 × 1023
= 0.75 × 6.023 × 1023 × molecules
(ii) Gram atomic mass of S = 32 g
32 g of S has 6.023 × 1023 number of atoms
Therefore, 192 g will have
= 6.023 × 10^{23}\over 32×192
= 192 \over 32 × 6.023 × 1023
= 6 × 6.023 × 1023 × molecules