explain what happens to the molecular motion and energy of 1 kg of water at 273 kelvin when it is changed into ice at the same temperature . how is latent heat of fusion related to the exchange that takes place during this change of state ?
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Latent heat of fusion:
It is the amount of heat (energy) which is taken from the surrounding or added to the system in order to change it from solid to liquid at constant temperature.
When water is converted to ice, heat is released to the surroundings
Now,
Energy of 1 kg of water = Latent heat x Mass
Energy of 1 kg of water = - 80 cal/g x 1000 g
Energy of 1 kg of water = - 80,000 cal
Negative sign shows that thermal energy is decreased.
This shows that when 1 kg of water is converted into ice, then 80,000 cal of energy is lost.
It is the amount of heat (energy) which is taken from the surrounding or added to the system in order to change it from solid to liquid at constant temperature.
When water is converted to ice, heat is released to the surroundings
Now,
Energy of 1 kg of water = Latent heat x Mass
Energy of 1 kg of water = - 80 cal/g x 1000 g
Energy of 1 kg of water = - 80,000 cal
Negative sign shows that thermal energy is decreased.
This shows that when 1 kg of water is converted into ice, then 80,000 cal of energy is lost.
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2
Explanation:
80,000 cal
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