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JAMB Physics 1983 Question 48

Question 48

Change of State and Vapours

The specific latent heat of vaporization of a substance is always

  1. A.less than its specific latent heat of fusion
  2. B.greater than its specific latent heat of fusion
  3. C.equal to its specific latent heat of fusion
  4. D.all of the above depending on the nature of the substance
  5. E.none of the above.
Show the answer and explanation

Answer: B (greater than its specific latent heat of fusion)

Explanation

Separating molecules completely to form a gas needs much more energy than loosening them to form a liquid, so latent heat of vaporisation is larger than that of fusion.