A 0.400 kg sample is placed in a cooling apparatus that removes energy as heat at a

Chapter 18, Problem 30

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A 0.400 kg sample is placed in a cooling apparatus that removes energy as heat at a constant rate. Figure 18-33 gives the temperature T of the sample versus time t; the horizontal scale is set by ts 80.0 min. The sample freezes during the energy removal. The specific heat of the sample in its initial liquid phase is 3000 J/kg K. What are (a) the samples heat of fusion and (b) its specific heat in the frozen phase? 3002702500t (min)ts Figure 18-33 30.

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