Question

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

Answer 1

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

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

Then, 16 g of solid sulphur contains =

= 3.76 × 10²² molecules (approx)