Why Does Transforming Water from 100°C Liquid to 100°C Gas

question 93

Multiple Choice

Why does transforming water from 100°C liquid to 100°C gas require much more energy than to raise the temperature of the same amount of water from absolute zero all the way to 100°C liquid?

• A)While water is in the solid phase, it is only necessary to impart energy to the water molecules themselves. Once in the liquid phase much more heat is required to impart sufficient energy to the molecules because there is more volume present.
• B)False! It does not require more energy to transform water from 100°C liquid to 100°C gas than to raise the temperature of the same amount of water from absolute zero all the way to 100°C liquid.
• C)Transforming water from 100°C liquid to 100°C gas requires breaking the hydrogen bonds between the liquid molecules.
• D)The amount of heat required to raise the temperature of the water or transform its phase is directly proportional to the densities of the water molecules involved. Obviously, driving liquid water to the vapor will drastically change its density.

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