Why is the heat of sublimation, ΔH subl equal to the sum of ΔH vap and ΔH fusion at the same

step 1 Everyone, my name is Ahmad Ali. To answer this, we will make equilibrium, which is the following

Why is the heat of sublimation, ΔH subl equal to the sum of...

Key Concepts

Sublimation

Sublimation is a phase transition in which a substance changes directly from the solid phase to the gas phase without passing through the liquid phase. The enthalpy associated with this process, known as the heat of sublimation, encompasses all the energy required to overcome the intermolecular forces that hold the solid together and to provide sufficient energy for the particles to exist in the gaseous state.

Fusion

Fusion, or melting, refers to the phase transition from a solid state to a liquid state. The heat of fusion is the amount of energy needed to break the fixed lattice structure of a solid and convert it into a liquid, while overcoming the attractive forces between molecules, without a change in temperature.

Vaporization

Vaporization is the phase transition from a liquid to a gas. The heat of vaporization is the energy required to overcome the intermolecular forces that hold the molecules together in the liquid phase, allowing them to disperse into the gas phase.

Hess's Law

Hess's Law states that the total enthalpy change for a chemical process is equal to the sum of the enthalpy changes for the individual steps that take place, regardless of the path taken. This principle explains why the heat of sublimation equals the sum of the heat of fusion and the heat of vaporization, because sublimation can be thought of as a two-step process that involves melting followed by vaporizing.

Transcript

Please give Ace some feedback