explain what happens to the molecular motion and energy 1kg of water at 273K when it is changed into ice at he same temperature. how is the latent heat of fusion related to the energy exchange that takes during the chnge of state??

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Solution

When water is converted to ice, the molecular motion decreases as heat is released to the surroundings.
Energy of 1kg water = latent heat x Mass
= -80cal/g x 1000 g
= -80,000 cal
(-) sign indicates that thermal energy is decreased.
Therfore, when 1 kg water is converted to ice at same temperature, 80,000 cal enrgy is lost.
Latent heat of fusion 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.

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