Physics · KINETIC THEORY

The density of liquid water is \( 1000\text{ kg m}^{-3} \) and the density of water vapour at \( 100^\circ\text{C} \) and \( 1\text{ atm} \) is \( 0.6\text{ kg m}^{-3} \). Assuming water molecules are packed closely in the liquid phase, if the average distance between molecules in liquid water is approximately \( 2\text{ Å} \), what is the average interatomic/intermolecular distance in the vapour phase under these conditions?

1. A
   \( 20\text{ Å} \)
2. B
   \( 24\text{ Å} \)
3. C
   \( 120\text{ Å} \)
4. D
   \( 40\text{ Å} \)