Question

Select all of the items that are true about a sample of water vapor at 101°C as it cools.

Answer 1

The answer would be: A) Its temperature will fall continuously until it condensed into a liquid.

If a water vapour cools, the temperature will continuously drop till it similar to the room temperature. Since the temperature of the room is not stated, it will be hard to determine to what point will the vapour cools.
Option A sound good, the temperature will drop until it condensed into a liquid, but it could drop more after that.  Option B is a bit vague since the vapour can steadily drop below 100°C.
Option C is false, the potential energy should be decreased since the condensed water would be pulled by gravitation. Option D is false because the temperature will continue to drop even if not all the vapour condenses.

Answer 2

Answer;

A) Its temperature will fall continuously until it condensed into a liquid.

Explanation;

• Steam or water vapor is the gaseous state of liquid water.  When water vapor above a temperature of 100 degrees Celsius is cooled, the temperature falls continuously, and it undergoes condensation at a temperature of 100 degrees Celsius and turns into liquid water.
• The change of state from gaseous to liquid state occurs as a result of latent heat of vaporization that the water vapor carries.