What does the enthalpy change for the reaction F2(g) → 2F(g) represent?
Understand the Problem
The question is asking about the meaning of the enthalpy change associated with the reaction where fluorine gas (F2) dissociates into individual fluorine atoms (F). Specifically, it seeks to identify whether this enthalpy change represents atomization energy, bond dissociation energy, or a fraction of these energies.
Answer
The energy required to dissociate F2 into 2F and corresponds to the bond dissociation energy.
The enthalpy change for the reaction F2(g) → 2F(g) represents the energy required to dissociate one mole of fluorine gas (F2) into two moles of fluorine atoms (F). This is known as the bond dissociation energy for the F-F bond.
Answer for screen readers
The enthalpy change for the reaction F2(g) → 2F(g) represents the energy required to dissociate one mole of fluorine gas (F2) into two moles of fluorine atoms (F). This is known as the bond dissociation energy for the F-F bond.
More Information
In thermochemistry, bond dissociation energy measures how much energy is needed to break a specific bond in a molecule into neutral atoms. For F2 gas, dissociating into individual fluoride atoms requires absorbing energy due to the breaking of a strong F-F single bond.
Sources
- 8.4: Standard Enthalpy and Hess' Law - Chemistry LibreTexts - chem.libretexts.org
- 5.4: Enthalpy of Reaction - Chemistry LibreTexts - chem.libretexts.org
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