(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?

Calculate the number of oxygen atoms in 0.10 mole of Na₂CO₃.10H₂O.

Calculate the number of moles in 12 g of oxygen gas

What mass of Ca will contain the same number of atoms as are present in 3.2 g of S?