Question 3
Change of State and VapoursThe latent heat of fusion of a substance is the heat required to
- A.raise the temperature of unit mass of the substance by 1°C
- B.maintain unit mass of the substance at constant temperature
- C.change unit mass of substance from solid to liquid at constant temperature
- D.change unit mass of liquid to vapour at constant temperature
- E.raise the temperature of unit mass by 100°C.
Show the answer and explanation
Answer: C (change unit mass of substance from solid to liquid at constant temperature)
Explanation
Specific latent heat of fusion is the heat needed to melt unit mass of a solid without changing its temperature. Option D describes vaporisation.