Acetic acid has a heat of fusion of 10.8 kj/mol and a heat of vaporization of 24.3 kj/mol. what is the expected value for the heat of sublimation of acetic acid

The expected heat of sublimation for acetic acid has been 35.1 kJ/mol.

The heat of vaporization has been the heat required for converting the liquids to vapor. The heat of sublimation has been the heat required to convert the 1 mole solid to gas.

The heat of fusion has been the change in the enthalpy by providing energy to the system.

The sublimation of acetic acid has been performed in two steps.

Solid to Liquid = Heat of fusion = 10.8 kJ/mol

Liquid to Gas = Heat of vaporization = 24.3 kJ/mol

The heat of sublimation = Heat of fusion + Heat of vaporization

Heat of Sublimation of acetic acid = 10.8 kJ/mol + 24.3 kJ/mol

The heat of sublimation of acetic acid = 35.1 kJ/mol.

The expected heat of sublimation for acetic acid has been 35.1 kJ/mol.

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35.1 kJ/mol

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

      (1)

      (1)

The final reaction is:  

    (3)

By adding (1) and (2)

Hence the expected value for the heat of sublimation of acetic acid is 35.1 kJ/mol