Select all of the items that are true about a sample of water vapor at 101°c as it cools.
a) its temperature will fall continuously until it condensed into a liquid.
b) its temperature will fall steadily until reaching 100°c.
c) the molecules of water gain potential energy.
d) its temperature will remain at 100°c until all the vapor condenses.

Option (D) is the correct answer.

Explanation:

Heat absorbed by a substance to change the state of matter is known as latent heat. This heat is utilized to break the bonds between atoms of the substance so that they can undergo phase change.

So, when water boils at 100 degree Celsius then temperature will remain constant unless and until all the water changes into vapor. As it is the latent heat that breaks the bonds between hydrogen and oxygen atoms of water so that liquid state can change into gaseous state.

Since latent heat is a hidden heat, that is why, it does not get reflected and there is no change in temperature due to it.

Thus, we can conclude that it is true that temperature will remain at 100°C until all the vapor condenses for a sample of water vapor at 101°C as it cools.

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