Summary:
- All solids absorb heat as they melt to become liquids.
- The gain of heat in this endothermic process goes into changing the state rather than changing the temperature.
- When 1 mol of water at 0°C freezes to ice, 6.01 kJ of heat are released into the surroundings.
- The molar heat of fusion of a substance is the heat absorbed by one mole of that substance as it is converted from a solid to a liquid.
- Since fusion and solidification of a given substance are the exact opposite processes, the numerical value of the molarheat of fusion is the same.