We have a sample of water vapor which cools from 150 °c to 125 °c. what happens to the motion of the molecules during this time of cooling?

The movement of the particles slows down.

Explanation:

Gases are formed when the energy in a system overcomes the attractive forces between the molecules. The gases expand to fill the space they occupy. In this way, the gas molecules interact little. In the gaseous state, the molecules move very quickly. As the temperature decreases, the amount of movement of the individual molecules also decreases.

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