Calculate the number of molecules of sulphur (S 8 ) present in 64 g of solid sulphur. (Given: At. Mass of S=32 u)

Question

Philoid · Accepted Answer

Given: At. Mass of S = 32 u

Atomic mass of S₈ = 8 × 32u = 256u

1 mole of Al atom = 6.022 × 10²³ atoms

This means 265g of S₈ has 6.022 × 10²³ molecules

Then 64g g contains:

⇒ Number of S₈ molecules = 1.5 × 10²³ molecules

Thus, the number of molecules of sulphur (S₈) is 1.5 × 10²³ molecules.