At room temperature, water is a liquid with a molar volume of 18 mL. At 105°C and 1 atm pressure, water is a gas and has a molar volume of over 30 L. Explain the large difference in molar volumes.

Here's what I get

Explanation:

In the liquid phase, the molecules are touching each other.

In the gas phase, the molecules are far apart from each other (about 500 times their diameters), so they occupy more space.