Question
What is the number of molecules of sulphur (S) present in 24 g of solid sulphur?
Answer
The atomic mass of sulphur (S) = 32 g
Molar mass of S8 = 32×8 = 256 g
256 g of S8 = 1 mole
∴ 24 g of S8 = 24\over256 = 0.09375 mole