At standard temperature and pressure (0 "C, 1 atm), a mole of liquid water occupies a volume of 18 cm3 and a mole of water vapor occupies 22.4 liters.
(a) Find the characteristic dimension of a single water molecule by considering the volume of a mole of the liquid.
(b) Roughly what is the characteristic separation of molecules in the water vapor?
(c) In the gas phase, how many times larger is the characteristic separation than the molecular size?