Liquid ammonia is used in ice factory for making ice from water. If water at 20oC is to be converted to 2kg ice at 0oC, how many grams of ammonia are to be evaporated? (Given:The latent heat of vapourization of ammonia = 341cal/g).
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Solution
Heat released in converting 2kg water at 20oC to 2kg ice at 0oC