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 ` )

Explanation

To solve the problem of how many grams of ammonia need to be evaporated to convert 2 kg of water at 20°C into ice at 0°C, we can follow these steps:

### Step 1: Calculate the heat required to convert water at 20°C to ice at 0°C

The total heat (Q) released during this process can be divided into two parts:

1. **Q1**: Heat released when water at 0°C is converted to ice at 0°C (latent heat of fusion).
2. **Q2**: Heat released when water at 20°C is cooled to water at 0°C.
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