A 445 g sample of ice at -58 o C is heated until its temperature reaches -29 o C. Find the change in heat content of the system.

1. A 445 g sample of ice at -58oC is heated until its temperature reaches -29oC. Find the change in heat content of the system.
2. A 152 g sample of ice at -37oC is heated until it turns into liquid water at 0oC. Find the change in heat content of the system.
3. A 218 g sample of steam at 121oC is cooled to ice at -14oC. Find the change in heat content of the system.