The best answer is choice 5, since density relates to the compactness of a substance, the more compact
Water vapor is less dense than ice because
1) molecules in the gas phase are in constant motion.
2) molecules in the gas phase have more potential energy than in solids.
3) molecules in the gas phase have more kinetic energy than in solids.
4) gaseous molecules have less mass.
5) molecules in the gas phase have more space between them than in solids.
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