Calculate the volume occupied by 320 g of sulphur dioxide at S.T.P.

[S = 32; O = 16]

(a) What do you understand by the statement that 'vapour density of carbon dioxide is 22'?

(b) Atomic mass of Chlorine is 35.5. What is it's vapour density?

Determine the number of molecules in a drop of water which weighs 0.09 g.

The molecular formula for elemental sulphur is S₈. In a sample of 5.12 g of sulphur:

(a) How many moles of sulphur are present?

(b) How many molecules and atoms are present?