An ice tray is removed from a freezer, where the ice was at a temperature of -11°C, and left on a countertop. If the mass of the ice is 0.29 kg, how much heat must be added in k to turn all the ice into kJ room temperature water (that is, liquid water at 20°C)? The specific heat of water is 4.2 kg C the heat kJ of fusion of water is 335 kg kJ and the specific heat of ice is 2.1 kg° C

University Physics Volume 2
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Chapter1: Temperature And Heat
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Problem 48P: A person taking a reading of the temperature in a freezer in Celsius makes two mistakes: first...
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An ice tray is removed from a freezer, where the ice was at a temperature of -11°C, and left on a
countertop. If the mass of the ice is 0.29 kg, how much heat must be added in k to turn all the ice into
room temperature water (that is, liquid water at 20°C)? The specific heat of water is 4.2
kgC
kJ
the heat
of fusion of water is 335
kg
kJ
and the specific heat of ice is 2.1
kg°C*
133.69
This is a change of phase question. There are 3 cases we have to consider:
1. The heat required to increase the temperature of the ice, Q1
2. The heat required to turn the ice into a liquid (a phase change), Q2
3. The heat required to raise the temperature of the now liquid water, Q3
For Q1, you will use the equation Q = mcATusing the c=2.1 kJ/(kg*C). Keep in mind that the
hp
Transcribed Image Text:An ice tray is removed from a freezer, where the ice was at a temperature of -11°C, and left on a countertop. If the mass of the ice is 0.29 kg, how much heat must be added in k to turn all the ice into room temperature water (that is, liquid water at 20°C)? The specific heat of water is 4.2 kgC kJ the heat of fusion of water is 335 kg kJ and the specific heat of ice is 2.1 kg°C* 133.69 This is a change of phase question. There are 3 cases we have to consider: 1. The heat required to increase the temperature of the ice, Q1 2. The heat required to turn the ice into a liquid (a phase change), Q2 3. The heat required to raise the temperature of the now liquid water, Q3 For Q1, you will use the equation Q = mcATusing the c=2.1 kJ/(kg*C). Keep in mind that the hp
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