Question

Which one of the following statements is true? Select one:

a. The heat of vaporization (Hvap) is greater than the heat of fusion (Hfus) for a substance.
b. Fusion is a process of changing substance from liquid to solid
c. Sublimation is the phase change from liquid to gas.
d. Sublimation is an exothermic process.

Answer 1

Answer: a. The heat of vaporization (Hvap) is greater than the heat of fusion (Hfus) for a substance.

Explanation: The heat of vaporization is the amount of heat required to convert a substance from a liquid to a gas at its boiling point, while the heat of fusion is the amount of heat required to convert a substance from a solid to a liquid at its melting point. In general, the heat of vaporization is higher than the heat of fusion for most substances.