Phase Changes

  How much heat transfer (in kilocalories) is required to thaw a 0.450-kg package of frozen vegetables originally at 0 °C if their heat of fusion is the same as that of water? 73. A bag containing 0 °C ice is much more effective in absorbing energy than one containing the same amount of 0 °C water. (a) How much heat transfer is necessary to raise the temperature of 0.800 kg of water from 0 °C to 30.0 °C? (b) How much heat transfer is required to first melt 0.800 kg of 0 °C ice and then raise its temperature? (c) Explain how your answer supports the contention that the ice is more effective.