In following equiation calculate value of H: 1kg ice at `-20^@C=H+1`kg water at `100^@C`, here H means heat required to change the state of substance.

Explanation

To solve the problem of calculating the heat (H) required to change 1 kg of ice at -20°C to 1 kg of water at 100°C, we will break down the process into three steps:

### Step 1: Heating the Ice from -20°C to 0°C
First, we need to calculate the heat required to raise the temperature of the ice from -20°C to 0°C.

- **Formula**:
\[
Q_1 = m \cdot s_{ice} \cdot \Delta T
...