Question

Select the correct answer. What is heat of vaporization? A. It is the heat required to change a substance’s temperature by 1°C. B. It is the heat required to change a gram of substance from a solid to a liquid. C. It is the heat required to change a substance from a solid directly to a gas. D. It is the heat required to change a gram of substance from a liquid to a gas. E. It is the heat required to separate one substance into two substances.

Answer 1

D. It is the heat required to change a gram of substance from a liquid to a gas.

Explanation:

The heat of vaporization is the heat required to change a gram of substance from a liquid to a gas.

• It is also known as the enthalpy of vaporization.
• The heat of vaporization is the quantity of heat needed to change one gram of a substance from liquid to gas.
• This heat of vaporization is dependent on the pressure conditions the process is taking place.
• Different liquids have their heat of vaporization.

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