Predict the sign of ΔG0 and ΔSuniverse for water freezing at -10℃ and 1 atm. Note that the normal freezing point of water is 0℃.
The normal freezing point of water is 0°C, so water freezing at -10°C is at a lower temperature than usual. This means that the process of water freezing at -10°C will be spontaneous, and therefore ΔG0 will be negative.
Since the process of water freezing at -10°C is happening at a lower temperature than usual, the entropy of the universe will increase as the water transitions from a liquid to a solid state. Therefore, ΔSuniverse will also be positive.