Q 10. Calculate the number of molecules of sulphur (S8 ) present in 16 g of solid sulphur.
Given the mass of Sulphur = 16 g
The molecular mass of the Sulphur molecule = 8 x 32 = 256 g.
The number of moles of Sulphur molecule :
Now
Number of molecules in 1 mole = molecules
So,
The number of molecules in 0.0625 moles = molecules.
= Molecules.
Hence there are Sulphur molecules in 16 g of solid sulphur.