Zumdahl Chemistry Chapter 10, 96 97 99.pdf - 96 a The plateau at the lowest temperature signifies the melting/freezing of the substance Hence the

Zumdahl Chemistry Chapter 10, 96 97 99.pdf - 96 a The...

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96. a. The plateau at the lowest temperature signifies the melting/freezing of the substance. Hence the freezing point is 20 C. b. The higher temperature plateau signifies the boiling/condensation of the substance. The temperature of this plateau is 120 C. c. X(s) X(l) H = H fusion ; X(l) X(g) H = H vaporization The heat of fusion and the heat of vaporization terms refer to enthalpy changes for the specific phase changes illustrated in the equations above. In a heating curve, energy is applied at a steady rate. So the longer, higher temperature plateau has a larger enthalpy change associated with it as compared to the shorter plateau. The higher temperature plateau occurs when a liquid is converting to a gas, so the heat of vaporization is greater than the heat of fusion. This is always the case because significantly more intermolecular forces are broken when a substance boils than when a substance melts.
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