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While doing the questions in the Kaplan book, I ran into this heating curve question that seems a little weird. It is question #69, and it asks what can be inferred from the heating curve that is shown. I thought that in a heating curve, where the amount of heat added is shown on the x-axis and the temperature is on the y-axis, the longer the horizontal lines for the heat of fusion and vaporization, the more amount of heat is being added to change the state. In the question, the horizontal line for heat of vaporization was shorter than that for heat of fusion, yet the answer that Kaplan gave said that the heat of vaporization is greater than the heat of fusion. Is Kaplan wrong or am I getting this wrong?
