Heat Is Added to a Substance at a Constant Rate

question 10

Multiple Choice

Heat is added to a substance at a constant rate. The substance starts as a solid and is melted; the liquid is heated and vaporized; finally, the vapor is heated. This process is shown in the graph. Which of the following statements is correct?

• A) The latent heat of fusion is greater than the latent heat of vaporization.
• B) The latent heat of vaporization is greater than the latent heat of fusion.
• C) The latent heat of vaporization is equal to the latent heat of fusion.
• D) The mass of the substance must be known before any statements about the latent heats can be made.
• E) The relative sizes of the latent heats depend on the rate at which the heat is added.

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