Question

The latent heat of vaporization of a substance is always:

• A. greater than its latent heat of fusion.
• B. greater than its latent heat of sublimation.
• C. equal to its latent heat of fusion.
• D. less than its latent heat of fusion.

Answer 1

The correct option is A greater than its latent heat of fusion.

The latent heat of vaporization is always greater than the latent heat of fusion because, in phase change from liquid to vapour, there is a large increase in volume. Hence, more heat is required as compared to phase change from solid to liquid.
The latent heat of sublimation at a particular temperature is the amount of heat required to convert a unit mass of solid into a gas.