Question

How many molecules and atoms of Sulphur are present in 0.1 mole of S₈ molecules.

Answer 1

1 mole of S₈ molecules = 6. 022x10²³ molecules 

0.1 mole of S₈ molecules = 6. 022x10²³ x 0.1 = 6.022 x 10²² molecules 

One molecule of S₈ contains 8 atoms of Sulphur 

Therefore 6.022x10²² molecules of S₈ contain =6.022 x 10²² x 8 = 4.816 x 10²³ atoms.