Starting as a solid at -25°C, a sample of water is heated at a constant rate until the sample is at 125°C. This heating occurs at standard pressure. The graph below represents the relationship between temperature and heat added to the sample.
Heating Curve for H2O
125
F
D
100.
E
75
Temperature (°C)
50.
25
BC
0-
-25-
<
12
20.
28
36
44
52
60.
Heat Added (kJ)
a. Explain, in terms of heat of fusion and heat of vaporization, why the heat added during interval DE is greater than the heat added
during BC for this sample of water.
b. Describe what happens to both the potential energy and the average kinetic energy of the molecules in the water sample duirng
interval AB
c. Using the graph, determine the total amount of heat added to the sample during interval

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