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Liquid ammonia is used in ice factory ...

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

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