At the normal boiling point of a material, the liquid phase has a density of 958 kg/m3,

Question:

At the normal boiling point of a material, the liquid phase has a density of 958 kg/m3, and the vapor phase has a density of 0.598 kg/m3. The average distance between neighboring molecules in the vapor phase is dvapor. The average distance between neighboring molecules in the liquid phase is dliquid. Determine the ratio dvapor/dliquid.