In Langmuir’s model of adsorption of a gas on a solid surface

Total volume of atoms present in a face-centre cubic unit cell of a metal is (r is atomic radius) :

Among the following mixtures, dipole-dipole as the major interaction, is present in

18 g of glucose (C₆H₁₂O₆) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at 100^oC is