Question

question from a molecule point of view, how is liquid water at 100° c similar and different than water vapor at 100° c?

Explanation:

Both liquid water and water vapor at 100°C are made of H₂O molecules. In liquid water, molecules are closer - packed with stronger intermolecular forces and more restricted motion. In water vapor, molecules are far apart, have weaker intermolecular forces and more freedom of motion.

Answer:

Similarity: Both consist of H₂O molecules. Difference: In liquid water, molecules are closer - packed with stronger intermolecular forces and less freedom of motion; in water vapor, molecules are far apart with weaker intermolecular forces and more freedom of motion.