Chapter 23, Problem 17A

To determine

To determine whether energy is absorbed or released when vapor turns to a liquid.

Answer to Problem 17A

When a vapor turns to liquid, it gives off energy.

Explanation of Solution

Introduction:

The process of conversion of vapor into liquid when vapor comes in contact with cooler molecules is called condensation.

The temperature of the vapor is decreased when it comes in contact with cooler molecules.

As a result, the energy of the molecules of the vapor is also decreased by releasing their extra energy in the form of heat.

Conclusion:

When a vapor turns to liquid, it gives off energy.