Consider the following situation.
- An ice cube was located in a freezer that maintained a temperature of -5.0 °C and a pressure of 0.95 atm.
- A power outage caused the freezer to warm to a temperature of 25°C and a pressure of 1.25 atm.
- After 24 hours, the local electrician was able to restore power to the freezer, allowing the freezer to return to a temperature of -5 °C and a pressure of 0.95 atm.
What is the sign of ΔH for step three?