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Question

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

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Solution

Heat released in converting 2kg water at 20oC to 2kg ice at 0oC
=(2000×20×1)+(2000×80)
Mass of ammonia evaporated = m gram
Heat used by ammonia = m×341
Heat loss = Heat gain
200000=m×341
m=586gram

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