Chemistry Practice Problems Kinetic Molecular Theory Practice Problems Solution: Water vapor is less dense than ice becauseA) molec...

Solution: Water vapor is less dense than ice becauseA) molecules in the gas phase are in constant motion.B) molecules in the gas phase have more potential energy than in solids.C) molecules in the gas phase have more kinetic energy than in solids.D) gaseous molecules have less mass.E) molecules in the gas phase have more space between them than in solids.

Problem

Water vapor is less dense than ice because
A) molecules in the gas phase are in constant motion.
B) molecules in the gas phase have more potential energy than in solids.
C) molecules in the gas phase have more kinetic energy than in solids.
D) gaseous molecules have less mass.
E) molecules in the gas phase have more space between them than in solids.

Solution

We are asked to select the best statement from multiple choices about why water vapor is less dense than ice.


In a gas, the distance between molecules, whether monatomic or polyatomic, is very large compared with the size of the molecules; thus, gases have a low density and are highly compressible.


In contrast, the molecules in solids are very close together, with essentially no empty space between them thus solids have higher density.

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