Calculate the number of molecules of sulphur (S8) present in 16g of solid sulphur.

1 mole of solid sulphur (S₈) = 8 × 32g = 256g

i.e., 256g of solid sulphur contains = 6.022 × 10²³ molecules

Then, 16g of solid sulpur contains {6.022×10^{23}\over 256} × 16 molecules

= 3.76 × 10²² molecules (approx)