To calculate the energy required to convert 245.0 g of ice at $-45.0\ ^\circ\text{C}$ to liquid water at $0.00\ ^\circ\text{C}$, we need to break the problem into two parts:

1. Heating the ice from $-45.0\ ^\circ\text{C}$ to $0.0\ ^\circ\text{C}$.
2. Melting the ice at $0.0\ ^\circ\text{C}$ to turn it into liquid water.

Step 1: Heating the ice

To calculate the heat required to raise the temperature of ice from $-45.0\ ^\circ\text{C}$ to (0.0\ ^\circ\text{C}\