The heat of sublimation can be approximated by adding together b) heat of fusion and heat of vaporization.
To understand this, let’s break down the terms involved:
- Heat of Fusion: This is the amount of energy required to change a substance from a solid to a liquid at its melting point.
- Heat of Vaporization: This is the amount of energy needed to change a substance from a liquid to a gas at its boiling point.
Sublimation is the process where a solid transitions directly into a gas, skipping the liquid phase. To calculate the heat required for this process, we need to consider the energy required to first melt the solid into a liquid (heat of fusion), and then to vaporize that liquid into gas (heat of vaporization). Therefore, the total energy required for sublimation can indeed be approximated by the sum of these two heat energies.