A closed thermally insulated vessel contains 100g of water at 0oC . If the an from this vessel in rapidly pumped out, intensive evaporation will produce cooling and as a result of this water will freeze. How much ice will be formed by this method? If latent heat of fusion is 80cal/g and of evaporation 560cal/g
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Solution
Let x gram of ice is formed by this
method and y gram of water gets evaporated.
The energy liberated by formation of ice is
used for water to get evaporated.