Real gases and vapors deviate from ideal behavior on account of intermolecular interactions. One equation of state for a real gas is the van der Waals equation, which is expressed in terms of two parameters, a and b. 

(a) For each of the following pairs of gases, decide which substance has the larger van der Waals a parameter:

(i) He and Ne; (ii) Ne and O₂; (iii) CO₂ and H₂; (iv) H₂CO and CH₄; (v) C₆H₆ and CH₃(CH₂)₁₀CH₃. 

(b) For each of the following pairs of gases, decide which substance has the larger van der Waals b parameter:

(i) F₂ and Br₂; (ii) Ne and F₂; (iii) CH₄ and CH₃CH₂CH₃; (iv) N₂ and Kr; (v) CO₂ and SO₂.